{
  "kind": "building",
  "id": "03-economic",
  "role": "economic",
  "name": "The Switchback Exchange",
  "function": "A cooperative book, produce and repair market turns a continuous trading promenade into a place for browsing, bargaining and exchanging skills.",
  "shape_and_silhouette": "Two broad ramps fold around an open slot to form a low inhabited bridge, with stepped shop roofs rising to a shared upper landing and a cross-passage beneath.",
  "visual_description": "Brick vaults carry timber stalls beneath a climbing sawtooth of tiled roofs, while folding green counters, redwood railings and reused stone thresholds make the building read as both market street and giant porch.",
  "production_notes": "A prosperous cooperative extends the canal workshop tradition with a reinforced-concrete ramp structure faced in brick and repairable timber shop modules on a flat freestanding site.",
  "departure": "The canal bridge becomes the market itself, folding back into a walkable trading loop without requiring water or sloping terrain beneath it.",
  "shared_traits": [
    "Brick working base",
    "Repairable plank shopfronts",
    "Clay roof tiles",
    "Redwood public galleries"
  ],
  "constraints": [
    "Two parallel shallow ramps and one upper connecting landing",
    "Visible structural support beneath all shops",
    "No canal or terrain dependency",
    "Shop doors open onto level inset landings"
  ],
  "idle_animation": "One folding shop shutter rocks gently on its stay and a small produce balance settles after use.",
  "day_night": "Warm stall lights form a stepped ribbon along the promenade and a few workshops remain lit beneath the ramps.",
  "version": 1,
  "image": "buildings/03-economic/renders/render-v002.png",
  "approved": true,
  "city_snapshot": "city-v001.md",
  "motif_snapshot": "motifs/brief-v001.md"
}