门牌解剖：四格跨国公寓剖面图

Visualizing apartments of different eras, different countries. Fun

prompt. 
INPUT: $ COUNTRY, optional $ CITY_DECADE_CONTEXT
// Build a residential culture potential field Φ over the 2×2 canvas.
Φ = housing_grammar($ COUNTRY, )
F = ∇Φ       // flow of domestic routines, movement of residents
Curl = ∇×Φ   // curvature of room layouts, spiral staircases from numeral curves
Div = ∇·F    // density of household objects and furniture detail
// Select 4 residential archetypes via gates:
GATES = select_four_archetypes(Φ, rules=['dense_urban','suburban','regional_traditional','unusual_transitional'])
// For each gate, derive: Room Type, Central Domestic Ritual, Signature Furniture, View/Exterior Context,
// Household Composition, Material Palette, Time of Day.
// Door plate geometry: oversized numerals are extruded; curves become staircases, holes become windows,
// stems become dividing walls, plate screws become columns/structural nodes.
// Cutaway: reveal one room where the ritual occurs.
// Residents: 2-4 tiny figures, posed according to the ritual.
// Authentic furniture and 5 household objects per panel, inferred from era and region.
// Window rule: include a subtle regional exterior clue.
// Camera: 30mm lens, elevated three-quarter cutaway, warm diegetic lighting, shallow DOF,
// slate-gray seamless exterior background. Fine fabric, laminate, wood, tile, plaster.
// Label: [Housing Type | City/Region | Country | Era].
Render 2×2 grid.
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