{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "bottom_tier", "op": {"type": "Cube", "size": {"x": 40, "y": 40, "z": 10}} },
    "2": { "id": 2, "name": "bottom_tier_centered", "op": {"type": "Translate", "child": 1, "offset": {"x": -20, "y": -20, "z": 0}} },
    "3": { "id": 3, "name": "middle_tier", "op": {"type": "Cube", "size": {"x": 28, "y": 28, "z": 10}} },
    "4": { "id": 4, "name": "middle_tier_placed", "op": {"type": "Translate", "child": 3, "offset": {"x": -14, "y": -14, "z": 10}} },
    "5": { "id": 5, "name": "top_tier", "op": {"type": "Cube", "size": {"x": 16, "y": 16, "z": 10}} },
    "6": { "id": 6, "name": "top_tier_placed", "op": {"type": "Translate", "child": 5, "offset": {"x": -8, "y": -8, "z": 20}} },
    "7": { "id": 7, "name": "union_bottom_middle", "op": {"type": "Union", "left": 2, "right": 4} },
    "8": { "id": 8, "name": "stepped_pyramid", "op": {"type": "Union", "left": 7, "right": 6} }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 8, "material": "default" }]
}