{
  "meta": {
    "title": "Catalog of colorings",
    "scope": "perfect periodic colour-pattern representatives with one, two, or three colours",
    "warning": "The finite classification is of colour-pattern types; literal motif geometries have infinitely many realizations.",
    "counts": {
      "wallpaper_groups": 17,
      "colour_groups": {
        "1": 17,
        "2": 46,
        "3": 23,
        "total": 86
      },
      "pattern_types": {
        "1": 51,
        "2": 88,
        "3": 59,
        "total": 198,
        "nontrivially_coloured": 147
      },
      "three_colour_actions": {
        "C3_regular": 8,
        "S3_nonregular": 15
      }
    },
    "definitions": {
      "pattern": "P*=(P,chi): a periodic monomotif pattern P together with a colour assignment chi on motif copies.",
      "chromatic": "The colour-symmetry group acts transitively on the colours.",
      "perfect": "Every symmetry of the uncoloured pattern induces a colour permutation.",
      "colour_pattern_type": "After colour relabelling: the same colour group, coloured-motif stabilizer/induced group, and coloured-motif-transitive subgroups.",
      "layout_discrepancy": "Weighted normalized symmetric nearest-pose and motif-count distance after colours are erased; 0 means identical motif centres, orientations, handedness, and count."
    },
    "sources": [
      {
        "work": "Tilings and Patterns",
        "authors": "Branko Grünbaum and G. C. Shephard",
        "chapter": 8,
        "printed_pages": "401–470"
      },
      {
        "work": "The Symmetries of Things",
        "authors": "John H. Conway, Heidi Burgiel, and Chaim Goodman-Strauss",
        "tables": "11.1 and 12.1"
      },
      {
        "work": "Dichromatic Dances",
        "author": "Karl Schaffer",
        "year": 2017,
        "figure": "10",
        "role": "independent two-colour index/orbifold crosswalk",
        "url": "https://archive.bridgesmathart.org/2017/bridges2017-291.pdf"
      },
      {
        "work": "Coloured Plane Groups",
        "authors": "K. Jarratt and R. L. E. Schwarzenberger",
        "year": 1980,
        "role": "index-3 chosen-colour subgroups and three-colour kernel cross-check",
        "url": "https://www.york.ac.uk/depts/maths/histstat/symmetry/coloured.pdf"
      },
      {
        "work": "The Symmetries of Things: Errors",
        "role": "official errata consulted for Table 12.1",
        "url": "https://www.mit.edu/~hlb/Symmetries_of_Things/SoTerrors.html"
      },
      {
        "work": "Wallpaper Groups",
        "author": "Eric W. Weisstein",
        "publisher": "Wolfram MathWorld",
        "role": "wallpaper-family directory thumbnails",
        "image_credit": "Patterns created with Artlandia SymmetryWorks",
        "url": "https://mathworld.wolfram.com/WallpaperGroups.html"
      }
    ]
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        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 426; the outlines mark the printed colour-group symbol and pattern-type label PP6[2]_3. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP6[2]_3 has underlying pattern type PP6.",
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        "work": "Tilings and Patterns",
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        "title": "Coloured occurrence PP14[2]_1 (underlying PP14)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 410; the outlines mark the printed colour-group symbol and pattern-type label PP14[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP14[2]_1 has underlying pattern type PP14.",
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        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-058-pp152-1.webp",
        "title": "Coloured occurrence PP15[2]_1 (underlying PP15)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 427; the outlines mark the printed colour-group symbol and pattern-type label PP15[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP15[2]_1 has underlying pattern type PP15.",
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        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-062-pp162-3.webp",
        "title": "Coloured occurrence PP16[2]_3 (underlying PP16)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 428; the outlines mark the printed colour-group symbol and pattern-type label PP16[2]_3. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP16[2]_3 has underlying pattern type PP16.",
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        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-016-pp112-1.webp",
        "title": "Coloured occurrence PP11[2]_1 (underlying PP11)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 410; the outlines mark the printed colour-group symbol and pattern-type label PP11[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP11[2]_1 has underlying pattern type PP11.",
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        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-053-pp122-1.webp",
        "title": "Coloured occurrence PP12[2]_1 (underlying PP12)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 427; the outlines mark the printed colour-group symbol and pattern-type label PP12[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP12[2]_1 has underlying pattern type PP12.",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-054-pp132-1.webp",
        "title": "Coloured occurrence PP13[2]_1 (underlying PP13)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 427; the outlines mark the printed colour-group symbol and pattern-type label PP13[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP13[2]_1 has underlying pattern type PP13.",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-014-pp92-1.webp",
        "title": "Coloured occurrence PP9[2]_1 (underlying PP9)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 410; the outlines mark the printed colour-group symbol and pattern-type label PP9[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP9[2]_1 has underlying pattern type PP9.",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-052-pp102-2.webp",
        "title": "Coloured occurrence PP10[2]_2 (underlying PP10)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 426; the outlines mark the printed colour-group symbol and pattern-type label PP10[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP10[2]_2 has underlying pattern type PP10.",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-026-pp172-1.webp",
        "title": "Coloured occurrence PP17[2]_1 (underlying PP17)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 411; the outlines mark the printed colour-group symbol and pattern-type label PP17[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP17[2]_1 has underlying pattern type PP17.",
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    {
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-065-pp182-3.webp",
        "title": "Coloured occurrence PP18[2]_3 (underlying PP18)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 428; the outlines mark the printed colour-group symbol and pattern-type label PP18[2]_3. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP18[2]_3 has underlying pattern type PP18.",
        "alt": "Annotated Chapter 8 occurrence PP18[2]_3, whose underlying one-colour pattern type is PP18.",
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    {
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-066-pp192-3.webp",
        "title": "Coloured occurrence PP19[2]_3 (underlying PP19)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 428; the outlines mark the printed colour-group symbol and pattern-type label PP19[2]_3. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP19[2]_3 has underlying pattern type PP19.",
        "alt": "Annotated Chapter 8 occurrence PP19[2]_3, whose underlying one-colour pattern type is PP19.",
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    {
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-070-pp202-5.webp",
        "title": "Coloured occurrence PP20[2]_5 (underlying PP20)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 428; the outlines mark the printed colour-group symbol and pattern-type label PP20[2]_5. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP20[2]_5 has underlying pattern type PP20.",
        "alt": "Annotated Chapter 8 occurrence PP20[2]_5, whose underlying one-colour pattern type is PP20.",
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    {
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      "gs_pattern_type": "PP30",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-033-pp302-1.webp",
        "title": "Coloured occurrence PP30[2]_1 (underlying PP30)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 412; the outlines mark the printed colour-group symbol and pattern-type label PP30[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP30[2]_1 has underlying pattern type PP30.",
        "alt": "Annotated Chapter 8 occurrence PP30[2]_1, whose underlying one-colour pattern type is PP30.",
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        "catalog_symbol": "PP30",
        "source_symbol": "PP30[2]_1",
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    {
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      "gs_pattern_type": "PP31",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-072-pp312-2.webp",
        "title": "Coloured occurrence PP31[2]_2 (underlying PP31)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP31[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP31[2]_2 has underlying pattern type PP31.",
        "alt": "Annotated Chapter 8 occurrence PP31[2]_2, whose underlying one-colour pattern type is PP31.",
        "printed_page": 429,
        "catalog_symbol": "PP31",
        "source_symbol": "PP31[2]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
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    },
    {
      "id": "cp-1-023-pp32",
      "colour_group_id": "cg-p4-1-1",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-073-pp322-1.webp",
        "title": "Coloured occurrence PP32[2]_1 (underlying PP32)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP32[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP32[2]_1 has underlying pattern type PP32.",
        "alt": "Annotated Chapter 8 occurrence PP32[2]_1, whose underlying one-colour pattern type is PP32.",
        "printed_page": 429,
        "catalog_symbol": "PP32",
        "source_symbol": "PP32[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
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      "colour_group_id": "cg-p4m-1-1",
      "wallpaper_id": "p4m",
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      "gs_pattern_type": "PP37",
      "underlying_pattern_type": "PP37",
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      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-038-pp372-1.webp",
        "title": "Coloured occurrence PP37[2]_1 (underlying PP37)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 412; the outlines mark the printed colour-group symbol and pattern-type label PP37[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP37[2]_1 has underlying pattern type PP37.",
        "alt": "Annotated Chapter 8 occurrence PP37[2]_1, whose underlying one-colour pattern type is PP37.",
        "printed_page": 412,
        "catalog_symbol": "PP37",
        "source_symbol": "PP37[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-025-pp38",
      "colour_group_id": "cg-p4m-1-1",
      "wallpaper_id": "p4m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP38",
      "underlying_pattern_type": "PP38",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-077-pp382-1.webp",
        "title": "Coloured occurrence PP38[2]_1 (underlying PP38)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP38[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP38[2]_1 has underlying pattern type PP38.",
        "alt": "Annotated Chapter 8 occurrence PP38[2]_1, whose underlying one-colour pattern type is PP38.",
        "printed_page": 429,
        "catalog_symbol": "PP38",
        "source_symbol": "PP38[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-026-pp39",
      "colour_group_id": "cg-p4m-1-1",
      "wallpaper_id": "p4m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP39",
      "underlying_pattern_type": "PP39",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-081-pp392-5.webp",
        "title": "Coloured occurrence PP39[2]_5 (underlying PP39)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP39[2]_5. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP39[2]_5 has underlying pattern type PP39.",
        "alt": "Annotated Chapter 8 occurrence PP39[2]_5, whose underlying one-colour pattern type is PP39.",
        "printed_page": 430,
        "catalog_symbol": "PP39",
        "source_symbol": "PP39[2]_5",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-027-pp40",
      "colour_group_id": "cg-p4m-1-1",
      "wallpaper_id": "p4m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP40",
      "underlying_pattern_type": "PP40",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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      "render_layout": {
        "kind": "orbit",
        "seeds": [
          {
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        "reference_pattern_id": "cp-1-024-pp37",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-079-pp402-4.webp",
        "title": "Coloured occurrence PP40[2]_4 (underlying PP40)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP40[2]_4. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP40[2]_4 has underlying pattern type PP40.",
        "alt": "Annotated Chapter 8 occurrence PP40[2]_4, whose underlying one-colour pattern type is PP40.",
        "printed_page": 429,
        "catalog_symbol": "PP40",
        "source_symbol": "PP40[2]_4",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-028-pp41",
      "colour_group_id": "cg-p4m-1-1",
      "wallpaper_id": "p4m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP41",
      "underlying_pattern_type": "PP41",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      "render_layout": {
        "kind": "orbit",
        "seeds": [
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-082-pp412-5.webp",
        "title": "Coloured occurrence PP41[2]_5 (underlying PP41)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP41[2]_5. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP41[2]_5 has underlying pattern type PP41.",
        "alt": "Annotated Chapter 8 occurrence PP41[2]_5, whose underlying one-colour pattern type is PP41.",
        "printed_page": 430,
        "catalog_symbol": "PP41",
        "source_symbol": "PP41[2]_5",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-029-pp33",
      "colour_group_id": "cg-p4g-1-1",
      "wallpaper_id": "p4g",
      "number_of_colours": 1,
      "gs_pattern_type": "PP33",
      "underlying_pattern_type": "PP33",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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      "render_layout": {
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        "candidate_index": 0
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-035-pp332-1.webp",
        "title": "Coloured occurrence PP33[2]_1 (underlying PP33)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 412; the outlines mark the printed colour-group symbol and pattern-type label PP33[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP33[2]_1 has underlying pattern type PP33.",
        "alt": "Annotated Chapter 8 occurrence PP33[2]_1, whose underlying one-colour pattern type is PP33.",
        "printed_page": 412,
        "catalog_symbol": "PP33",
        "source_symbol": "PP33[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-030-pp34",
      "colour_group_id": "cg-p4g-1-1",
      "wallpaper_id": "p4g",
      "number_of_colours": 1,
      "gs_pattern_type": "PP34",
      "underlying_pattern_type": "PP34",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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        "candidate_index": 1
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-074-pp342-1.webp",
        "title": "Coloured occurrence PP34[2]_1 (underlying PP34)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP34[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP34[2]_1 has underlying pattern type PP34.",
        "alt": "Annotated Chapter 8 occurrence PP34[2]_1, whose underlying one-colour pattern type is PP34.",
        "printed_page": 429,
        "catalog_symbol": "PP34",
        "source_symbol": "PP34[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-031-pp35",
      "colour_group_id": "cg-p4g-1-1",
      "wallpaper_id": "p4g",
      "number_of_colours": 1,
      "gs_pattern_type": "PP35",
      "underlying_pattern_type": "PP35",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-075-pp352-2.webp",
        "title": "Coloured occurrence PP35[2]_2 (underlying PP35)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP35[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP35[2]_2 has underlying pattern type PP35.",
        "alt": "Annotated Chapter 8 occurrence PP35[2]_2, whose underlying one-colour pattern type is PP35.",
        "printed_page": 429,
        "catalog_symbol": "PP35",
        "source_symbol": "PP35[2]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-032-pp36",
      "colour_group_id": "cg-p4g-1-1",
      "wallpaper_id": "p4g",
      "number_of_colours": 1,
      "gs_pattern_type": "PP36",
      "underlying_pattern_type": "PP36",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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      "render_layout": {
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        ],
        "reference_pattern_id": "cp-1-029-pp33",
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        "candidate_index": 3
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-076-pp362-2.webp",
        "title": "Coloured occurrence PP36[2]_2 (underlying PP36)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP36[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP36[2]_2 has underlying pattern type PP36.",
        "alt": "Annotated Chapter 8 occurrence PP36[2]_2, whose underlying one-colour pattern type is PP36.",
        "printed_page": 429,
        "catalog_symbol": "PP36",
        "source_symbol": "PP36[2]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-033-pp21",
      "colour_group_id": "cg-p3-1-1",
      "wallpaper_id": "p3",
      "number_of_colours": 1,
      "gs_pattern_type": "PP21",
      "underlying_pattern_type": "PP21",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
      },
      "render_layout": {
        "kind": "orbit",
        "seeds": [
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            "angle": 17.0,
            "colour": 0
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        ],
        "reference_pattern_id": "cp-1-033-pp21",
        "colour_blind_discrepancy": 0.0,
        "candidate_index": 0
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-014-pp213-1.webp",
        "title": "Coloured occurrence PP21[3]_1 (underlying PP21)",
        "context": "Grünbaum-Shephard Figure 8.2.3 on printed p. 415; the outlines mark the printed colour-group symbol and pattern-type label PP21[3]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP21[3]_1 has underlying pattern type PP21.",
        "alt": "Annotated Chapter 8 occurrence PP21[3]_1, whose underlying one-colour pattern type is PP21.",
        "printed_page": 415,
        "catalog_symbol": "PP21",
        "source_symbol": "PP21[3]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-034-pp22",
      "colour_group_id": "cg-p3-1-1",
      "wallpaper_id": "p3",
      "number_of_colours": 1,
      "gs_pattern_type": "PP22",
      "underlying_pattern_type": "PP22",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
      },
      "render_layout": {
        "kind": "orbit",
        "seeds": [
          {
            "point": [
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            "angle": 23.0,
            "colour": 0
          }
        ],
        "reference_pattern_id": "cp-1-033-pp21",
        "colour_blind_discrepancy": 0.008654,
        "candidate_index": 1
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-041-pp223-2.webp",
        "title": "Coloured occurrence PP22[3]_2 (underlying PP22)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 433; the outlines mark the printed colour-group symbol and pattern-type label PP22[3]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP22[3]_2 has underlying pattern type PP22.",
        "alt": "Annotated Chapter 8 occurrence PP22[3]_2, whose underlying one-colour pattern type is PP22.",
        "printed_page": 433,
        "catalog_symbol": "PP22",
        "source_symbol": "PP22[3]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-035-pp27",
      "colour_group_id": "cg-p3m1-1-1",
      "wallpaper_id": "p3m1",
      "number_of_colours": 1,
      "gs_pattern_type": "PP27",
      "underlying_pattern_type": "PP27",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
      },
      "render_layout": {
        "kind": "orbit",
        "seeds": [
          {
            "point": [
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            "angle": 17.0,
            "colour": 0
          }
        ],
        "reference_pattern_id": "cp-1-035-pp27",
        "colour_blind_discrepancy": 0.0,
        "candidate_index": 0
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-032-pp272.webp",
        "title": "Coloured occurrence PP27[2] (underlying PP27)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 412; the outlines mark the printed colour-group symbol and pattern-type label PP27[2]. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP27[2] has underlying pattern type PP27.",
        "alt": "Annotated Chapter 8 occurrence PP27[2], whose underlying one-colour pattern type is PP27.",
        "printed_page": 412,
        "catalog_symbol": "PP27",
        "source_symbol": "PP27[2]",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-036-pp28",
      "colour_group_id": "cg-p3m1-1-1",
      "wallpaper_id": "p3m1",
      "number_of_colours": 1,
      "gs_pattern_type": "PP28",
      "underlying_pattern_type": "PP28",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
      },
      "render_layout": {
        "kind": "orbit",
        "seeds": [
          {
            "point": [
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              0.137
            ],
            "angle": 23.0,
            "colour": 0
          }
        ],
        "reference_pattern_id": "cp-1-035-pp27",
        "colour_blind_discrepancy": 0.008654,
        "candidate_index": 1
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-045-pp283-1.webp",
        "title": "Coloured occurrence PP28[3]_1 (underlying PP28)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 433; the outlines mark the printed colour-group symbol and pattern-type label PP28[3]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP28[3]_1 has underlying pattern type PP28.",
        "alt": "Annotated Chapter 8 occurrence PP28[3]_1, whose underlying one-colour pattern type is PP28.",
        "printed_page": 433,
        "catalog_symbol": "PP28",
        "source_symbol": "PP28[3]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-037-pp29",
      "colour_group_id": "cg-p3m1-1-1",
      "wallpaper_id": "p3m1",
      "number_of_colours": 1,
      "gs_pattern_type": "PP29",
      "underlying_pattern_type": "PP29",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
      },
      "render_layout": {
        "kind": "orbit",
        "seeds": [
          {
            "point": [
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              0.137
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            "angle": 11.0,
            "colour": 0
          }
        ],
        "reference_pattern_id": "cp-1-035-pp27",
        "colour_blind_discrepancy": 0.008654,
        "candidate_index": 2
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-047-pp293-2.webp",
        "title": "Coloured occurrence PP29[3]_2 (underlying PP29)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 433; the outlines mark the printed colour-group symbol and pattern-type label PP29[3]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP29[3]_2 has underlying pattern type PP29.",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-031-pp232.webp",
        "title": "Coloured occurrence PP23[2] (underlying PP23)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 412; the outlines mark the printed colour-group symbol and pattern-type label PP23[2]. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP23[2] has underlying pattern type PP23.",
        "alt": "Annotated Chapter 8 occurrence PP23[2], whose underlying one-colour pattern type is PP23.",
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        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
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      "colour_group_id": "cg-p31m-1-1",
      "wallpaper_id": "p31m",
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      "gs_pattern_type": "PP24",
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      "source": {
        "work": "Tilings and Patterns",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-071-pp242.webp",
        "title": "Coloured occurrence PP24[2] (underlying PP24)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 429; the outlines mark the printed colour-group symbol and pattern-type label PP24[2]. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP24[2] has underlying pattern type PP24.",
        "alt": "Annotated Chapter 8 occurrence PP24[2], whose underlying one-colour pattern type is PP24.",
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        "catalog_symbol": "PP24",
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        "relationship": "underlying-pattern-type"
      }
    },
    {
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      "colour_group_id": "cg-p31m-1-1",
      "wallpaper_id": "p31m",
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      "gs_pattern_type": "PP25",
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      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-042-pp253-1.webp",
        "title": "Coloured occurrence PP25[3]_1 (underlying PP25)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 433; the outlines mark the printed colour-group symbol and pattern-type label PP25[3]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP25[3]_1 has underlying pattern type PP25.",
        "alt": "Annotated Chapter 8 occurrence PP25[3]_1, whose underlying one-colour pattern type is PP25.",
        "printed_page": 433,
        "catalog_symbol": "PP25",
        "source_symbol": "PP25[3]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-041-pp26",
      "colour_group_id": "cg-p31m-1-1",
      "wallpaper_id": "p31m",
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      "gs_pattern_type": "PP26",
      "underlying_pattern_type": "PP26",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-044-pp263-2.webp",
        "title": "Coloured occurrence PP26[3]_2 (underlying PP26)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 433; the outlines mark the printed colour-group symbol and pattern-type label PP26[3]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP26[3]_2 has underlying pattern type PP26.",
        "alt": "Annotated Chapter 8 occurrence PP26[3]_2, whose underlying one-colour pattern type is PP26.",
        "printed_page": 433,
        "catalog_symbol": "PP26",
        "source_symbol": "PP26[3]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-042-pp42",
      "colour_group_id": "cg-p6-1-1",
      "wallpaper_id": "p6",
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      "gs_pattern_type": "PP42",
      "underlying_pattern_type": "PP42",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-043-pp422.webp",
        "title": "Coloured occurrence PP42[2] (underlying PP42)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 413; the outlines mark the printed colour-group symbol and pattern-type label PP42[2]. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP42[2] has underlying pattern type PP42.",
        "alt": "Annotated Chapter 8 occurrence PP42[2], whose underlying one-colour pattern type is PP42.",
        "printed_page": 413,
        "catalog_symbol": "PP42",
        "source_symbol": "PP42[2]",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-043-pp43",
      "colour_group_id": "cg-p6-1-1",
      "wallpaper_id": "p6",
      "number_of_colours": 1,
      "gs_pattern_type": "PP43",
      "underlying_pattern_type": "PP43",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-048-pp433-1.webp",
        "title": "Coloured occurrence PP43[3]_1 (underlying PP43)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 434; the outlines mark the printed colour-group symbol and pattern-type label PP43[3]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP43[3]_1 has underlying pattern type PP43.",
        "alt": "Annotated Chapter 8 occurrence PP43[3]_1, whose underlying one-colour pattern type is PP43.",
        "printed_page": 434,
        "catalog_symbol": "PP43",
        "source_symbol": "PP43[3]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-044-pp44",
      "colour_group_id": "cg-p6-1-1",
      "wallpaper_id": "p6",
      "number_of_colours": 1,
      "gs_pattern_type": "PP44",
      "underlying_pattern_type": "PP44",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-084-pp442.webp",
        "title": "Coloured occurrence PP44[2] (underlying PP44)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP44[2]. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP44[2] has underlying pattern type PP44.",
        "alt": "Annotated Chapter 8 occurrence PP44[2], whose underlying one-colour pattern type is PP44.",
        "printed_page": 430,
        "catalog_symbol": "PP44",
        "source_symbol": "PP44[2]",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-045-pp45",
      "colour_group_id": "cg-p6-1-1",
      "wallpaper_id": "p6",
      "number_of_colours": 1,
      "gs_pattern_type": "PP45",
      "underlying_pattern_type": "PP45",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-050-pp453-2.webp",
        "title": "Coloured occurrence PP45[3]_2 (underlying PP45)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 434; the outlines mark the printed colour-group symbol and pattern-type label PP45[3]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP45[3]_2 has underlying pattern type PP45.",
        "alt": "Annotated Chapter 8 occurrence PP45[3]_2, whose underlying one-colour pattern type is PP45.",
        "printed_page": 434,
        "catalog_symbol": "PP45",
        "source_symbol": "PP45[3]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-046-pp46",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP46",
      "underlying_pattern_type": "PP46",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-044-pp462-1.webp",
        "title": "Coloured occurrence PP46[2]_1 (underlying PP46)",
        "context": "Grünbaum-Shephard Figure 8.2.2 on printed p. 413; the outlines mark the printed colour-group symbol and pattern-type label PP46[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP46[2]_1 has underlying pattern type PP46.",
        "alt": "Annotated Chapter 8 occurrence PP46[2]_1, whose underlying one-colour pattern type is PP46.",
        "printed_page": 413,
        "catalog_symbol": "PP46",
        "source_symbol": "PP46[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-047-pp47",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP47",
      "underlying_pattern_type": "PP47",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-085-pp472-1.webp",
        "title": "Coloured occurrence PP47[2]_1 (underlying PP47)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP47[2]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP47[2]_1 has underlying pattern type PP47.",
        "alt": "Annotated Chapter 8 occurrence PP47[2]_1, whose underlying one-colour pattern type is PP47.",
        "printed_page": 430,
        "catalog_symbol": "PP47",
        "source_symbol": "PP47[2]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-048-pp48",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP48",
      "underlying_pattern_type": "PP48",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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        "reference_pattern_id": "cp-1-046-pp46",
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      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-086-pp48a2-2.webp",
        "title": "Coloured occurrence PP48A[2]_2 (underlying PP48)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP48A[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP48A[2]_2 has underlying pattern type PP48.",
        "alt": "Annotated Chapter 8 occurrence PP48A[2]_2, whose underlying one-colour pattern type is PP48.",
        "printed_page": 430,
        "catalog_symbol": "PP48",
        "source_symbol": "PP48A[2]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-049-pp49",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP49",
      "underlying_pattern_type": "PP49",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
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        "reference_pattern_id": "cp-1-046-pp46",
        "colour_blind_discrepancy": 0.017308,
        "candidate_index": 3
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-054-pp493-1.webp",
        "title": "Coloured occurrence PP49[3]_1 (underlying PP49)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 434; the outlines mark the printed colour-group symbol and pattern-type label PP49[3]_1. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP49[3]_1 has underlying pattern type PP49.",
        "alt": "Annotated Chapter 8 occurrence PP49[3]_1, whose underlying one-colour pattern type is PP49.",
        "printed_page": 434,
        "catalog_symbol": "PP49",
        "source_symbol": "PP49[3]_1",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-050-pp50",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP50",
      "underlying_pattern_type": "PP50",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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            "angle": 5.0,
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        "reference_pattern_id": "cp-1-046-pp46",
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        "candidate_index": 4
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-2-088-pp502-2.webp",
        "title": "Coloured occurrence PP50[2]_2 (underlying PP50)",
        "context": "Grünbaum-Shephard Figure 8.3.5 on printed p. 430; the outlines mark the printed colour-group symbol and pattern-type label PP50[2]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP50[2]_2 has underlying pattern type PP50.",
        "alt": "Annotated Chapter 8 occurrence PP50[2]_2, whose underlying one-colour pattern type is PP50.",
        "printed_page": 430,
        "catalog_symbol": "PP50",
        "source_symbol": "PP50[2]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-1-051-pp51",
      "colour_group_id": "cg-p6m-1-1",
      "wallpaper_id": "p6m",
      "number_of_colours": 1,
      "gs_pattern_type": "PP51",
      "underlying_pattern_type": "PP51",
      "underlying_pattern_is_primitive": false,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 5
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            "angle": 35.0,
            "colour": 0
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        "reference_pattern_id": "cp-1-046-pp46",
        "colour_blind_discrepancy": 0.025961,
        "candidate_index": 5
      },
      "book_excerpt": {
        "work": "Tilings and Patterns",
        "image": "output/color-pattern-excerpts/gs-cp-3-059-pp513-2.webp",
        "title": "Coloured occurrence PP51[3]_2 (underlying PP51)",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 435; the outlines mark the printed colour-group symbol and pattern-type label PP51[3]_2. The supplied excerpt contains Chapter 8, not the Chapter 5 one-colour plates. This is an indirect cross-reference: PP51[3]_2 has underlying pattern type PP51.",
        "alt": "Annotated Chapter 8 occurrence PP51[3]_2, whose underlying one-colour pattern type is PP51.",
        "printed_page": 435,
        "catalog_symbol": "PP51",
        "source_symbol": "PP51[3]_2",
        "direct_source": false,
        "relationship": "underlying-pattern-type"
      }
    },
    {
      "id": "cp-2-001-pp12",
      "colour_group_id": "cg-p1-2-1",
      "wallpaper_id": "p1",
      "number_of_colours": 2,
      "gs_pattern_type": "PP1[2]",
      "underlying_pattern_type": "PP1",
      "underlying_pattern_is_primitive": true,
      "representative_is_perfect": true,
      "source": {
        "work": "Tilings and Patterns",
        "chapter": 8,
        "figure": "Figure 8.2.2, pp. 408–413",
        "printed_page": 408
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        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 435; the outlines mark the printed colour-group symbol and pattern-type label PP49[3]_2.",
        "alt": "Annotated Grünbaum-Shephard figure with its colour-group symbol and pattern-type label PP49[3]_2 outlined.",
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        "title": "Pattern type PP51[3]_2",
        "context": "Grünbaum-Shephard Figure 8.3.6 on printed p. 435; the outlines mark the printed colour-group symbol and pattern-type label PP51[3]_2.",
        "alt": "Annotated Grünbaum-Shephard figure with its colour-group symbol and pattern-type label PP51[3]_2 outlined.",
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}