{
  "title": "Boom Barrier",
  "description": "A car park boom on a cabinet: a retroreflective banded arm that raises through a right angle, over a moulded case with a louvred vent. The kit's cleanest demonstration that one rotation inverts what an object means.",
  "category": "Street",
  "tags": ["contemporary", "street", "traffic", "procedural"],
  "controls": {
    "boom": { "type": "number", "label": "Boom length", "min": 1, "max": 8, "step": 0.05, "unit": "m" },
    "height": { "type": "number", "label": "Cabinet height", "min": 0.6, "max": 1.6, "step": 0.01, "unit": "m" },
    "band": { "type": "number", "label": "Band length", "min": 0.08, "max": 1, "step": 0.01, "unit": "m" },
    "raised": { "type": "number", "label": "Boom raised", "min": 0, "max": 1, "step": 0.05 },
    "seed": { "type": "number", "label": "Variation seed", "min": 1, "max": 64, "step": 1 }
  },
  "materialSlots": ["steelPainted", "retroreflective", "plastic"],
  "parts": ["cabinet", "boom"]
}