{
  "kind": "building",
  "id": "03-economic",
  "role": "economic",
  "name": "The Thousand-Gill Exchange",
  "function": "A cooperative market trades cultivated food, shell stock and recovered materials through dry merchant pods opening onto a shared submerged trading court.",
  "shape_and_silhouette": "A low flattened rosette spreads twelve enormous overlapping shell gills around an open central court, with six glass trading pearls embedded beneath its scalloped rim.",
  "visual_description": "Salvaged shell roofs alternate rough broken edges with finely repaired bronze seams, while expensive blue-green glass pods and kelp combs advertise collective prosperity.",
  "production_notes": "A merchant cooperative combines the repair tradition with later civic glazing, forming a freestanding market suited to the junction of swimming lanes.",
  "departure": "Stretch the building almost flat into a broad living rosette, concentrating wealth in discrete pressure bubbles rather than a monumental central dome.",
  "shared_traits": [
    "Reused shell hoods",
    "Heavy bronze glass collars",
    "Illuminated kelp cultivation racks"
  ],
  "constraints": [
    "Court is exterior flooded space, not an exposed interior",
    "Six glass pods and twelve shell canopy plates",
    "Canopy plates do not form the pressure enclosure",
    "No central tower or dome"
  ],
  "idle_animation": "Kelp ribbons sway gently beside the fixed pods and small green culture lights brighten in a slow trading-cycle sequence.",
  "day_night": "An operating schedule lights all six trading pearls during market hours; closed hours leave only lock and lane lights on.",
  "version": 1,
  "image": "buildings/03-economic/renders/render-v001.webp",
  "approved": false,
  "city_snapshot": "buildings/03-economic/renders/city-v001.md",
  "motif_snapshot": "buildings/03-economic/renders/motifs-v001.md"
}