{
  "kind": "building",
  "id": "shell-dwelling",
  "role": "residence",
  "name": "Shell Dwelling",
  "footprint": "1.5×1.33 tiles",
  "function": "A terrace home shelters eight residents and keeps their daily brine provisions close to a guided signal line.",
  "shape_and_silhouette": "A compact dwelling grows from a dense black entry knot into two unequal lateral roof ribs that slash across the pale shell, cross over a narrow rear spine and end in hard needle tips.",
  "visual_description": "Black basalt and conductive ribs dominate the front, side and top views as layered tapering strokes; chalk-ceramic wall pockets and two small bone-glass windows appear only in the open spaces between hooked branches.",
  "production_notes": "The front +Z doorway sits inside a thick load-bearing junction, two paired but unequal curved ribs span from four basalt feet to a straight rear ridge, short struts carry inset ceramic wall panels, and the left and right side elevations expose different loops, crossings and pointed ends without requiring freeform wall surfaces.",
  "departure": "The ordinary home compresses Serravane’s intense black sigil grammar into a small inhabited knot rather than softening it into a decorative cottage.",
  "shared_traits": [
    "Black structural ribs vary from heavy roots at junctions to needle-thin tips, with finer secondary filament lines.",
    "Several ribs converge into dense asymmetric knots, then splay into long crossing sweeps with sharp hooked terminals.",
    "Pale ceramic or bone-glass infill occupies isolated pockets inside a predominantly black visible skeleton."
  ],
  "constraints": [
    "Keep geometry inside the fixed 36×32 world-unit footprint and the main door centered on the +Z front.",
    "Black structural strokes must read first at game scale, with pale wall panels secondary and at least one dense crossing zone visible from the top.",
    "Use extruded tapered ribs and fine curves with visible anchors; avoid petal roofs, elven arches and ornamental scrollwork."
  ],
  "idle_animation": "The two oval shutter leaves open by a few degrees and settle closed in a slow irregular breathing cycle.",
  "day_night": "By day the bone glass is smoky silver; at night a dim warm interior glow shows through it while one cold-teal pulse occasionally travels the black door line."
}