{
  "schema": 1,
  "evidence_class": "illustrative",
  "units": "dimensionless illustration units",
  "axes": {
    "x": "right",
    "y": "up",
    "z": "front"
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      },
      "bounds": {
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      "topology": {
        "vertices": 228,
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        "faces": 460,
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    },
    {
      "id": "low-arch",
      "number": "05",
      "name": "Low arch",
      "family": "Arch",
      "kind": "arch",
      "opening": "Open to the base",
      "holes": 0,
      "genus": 0,
      "description": "A roof joins two legs above a gap that reaches the base of the illustration.",
      "look": "Look underneath to distinguish the inner roof from the top surface.",
      "lesson": "In this model the gap meets the base; this is a shape comparison, not a formal arch classification.",
      "shape": "broad",
      "arch": [
        0,
        1.35,
        2.7
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      "profile": {
        "model": {
          "id": "low-arch",
          "number": "05",
          "name": "Low arch",
          "family": "Arch",
          "kind": "arch",
          "opening": "Open to the base",
          "holes": 0,
          "genus": 0,
          "description": "A roof joins two legs above a gap that reaches the base of the illustration.",
          "look": "Look underneath to distinguish the inner roof from the top surface.",
          "lesson": "In this model the gap meets the base; this is a shape comparison, not a formal arch classification.",
          "shape": "broad",
          "arch": [
            0,
            1.35,
            2.7
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        },
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            -3.55,
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            -0.28,
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            -1.52,
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            -2.29,
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            -2.83,
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          [
            -3.26,
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          [
            -3.19,
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        ],
        "holes": []
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      "bounds": {
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          -3.55,
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      },
      "topology": {
        "vertices": 102,
        "edges": 300,
        "faces": 200,
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    },
    {
      "id": "offset-arch",
      "number": "06",
      "name": "Offset arch",
      "family": "Arch",
      "kind": "arch",
      "opening": "Open to the base",
      "holes": 0,
      "genus": 0,
      "description": "An off-center gap leaves unequal legs. The narrower leg is not a calculated failure point.",
      "look": "Compare the remaining rock on either side as you change the opening width.",
      "lesson": "Shape alone does not supply rock strength, loading, or a collapse date.",
      "shape": "ridge",
      "arch": [
        0.56,
        1.15,
        2.85
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      "profile": {
        "model": {
          "id": "offset-arch",
          "number": "06",
          "name": "Offset arch",
          "family": "Arch",
          "kind": "arch",
          "opening": "Open to the base",
          "holes": 0,
          "genus": 0,
          "description": "An off-center gap leaves unequal legs. The narrower leg is not a calculated failure point.",
          "look": "Compare the remaining rock on either side as you change the opening width.",
          "lesson": "Shape alone does not supply rock strength, loading, or a collapse date.",
          "shape": "ridge",
          "arch": [
            0.56,
            1.15,
            2.85
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        },
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            -3,
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        ],
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        "max": [
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      },
      "topology": {
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    },
    {
      "id": "shallow-alcove",
      "number": "07",
      "name": "Shallow alcove",
      "family": "Alcove",
      "kind": "blind",
      "opening": "Recess with a back wall",
      "holes": 1,
      "genus": 0,
      "description": "A pocket opens on the front face but stops within the rock. It is not a through-window.",
      "look": "Peel the face and inspect from the back to find the rock behind the recess.",
      "lesson": "A shadowed recess and a through-hole can look similar from a single view.",
      "shape": "ridge",
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      ],
      "recess": 0.32,
      "profile": {
        "model": {
          "id": "shallow-alcove",
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          "name": "Shallow alcove",
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          "kind": "blind",
          "opening": "Recess with a back wall",
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          "description": "A pocket opens on the front face but stops within the rock. It is not a through-window.",
          "look": "Peel the face and inspect from the back to find the rock behind the recess.",
          "lesson": "A shadowed recess and a through-hole can look similar from a single view.",
          "shape": "ridge",
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              1.2,
              1.03
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          ],
          "recess": 0.32
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