{
  "kind": "building",
  "id": "filament-nursery",
  "role": "resource-collector",
  "name": "Filament Nursery",
  "footprint": "2.33×1.83 tiles",
  "function": "Tenders cultivate living fiber beside an open filament bed, harvesting mature strands while leaving space for the bed to regrow.",
  "shape_and_silhouette": "A low circular drum of about 42 world-unit diameter carries a continuous black annular canopy with a broad open oculus, so the front, left and right elevations have the same wide rounded saucer profile rather than a peaked roof.",
  "visual_description": "Heavy black arcs wrap the full circumference at one low height while irregular tapered ribs cross the horizontal oculus and knot off-center without rising to an apex; three cloudy vats and small pale infill pockets remain visible through open bays on every side.",
  "production_notes": "The circular curb fits inside the fixed rectangular gameplay footprint, a +Z gap opens through a ring of eight equally low anchored posts, the canopy's inner and outer rings sit at almost the same height with short radial braces between them, three vat cradles form a loose triangle around a central tending court, and low storage racks occupy separated perimeter bays.",
  "departure": "Its all-around circular perimeter and flat annular black knot replace the former high-pitched canopy while preserving the signal nursery's three-vat work layout.",
  "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 the round curb about 42 world units in diameter inside the fixed 56×44 world-unit footprint and preserve the +Z front gate.",
    "Make front, rear, left and right elevations equally developed and similarly rounded, with no view showing a triangular outline.",
    "Keep the black oculus knot nearly level with the perimeter ring; anchor every sweep to ring braces and avoid a central peak, ridge, gable, slatted roof, greenhouse or front-facing pavilion."
  ],
  "idle_animation": "The teal tips brighten in sequence along one nursery strand while its free end sways only slightly.",
  "day_night": "Daylight makes the vats cloudy silver; after dark the liquid and a few terminal buds glow a restrained cold teal."
}