
0. wall luminance L(x) monotone ↓ in local thickness d(x), monotone ↑ in proximity to its practical; thin walls HOT, thick slabs DENSE; cut edges (d = d_min) = argmax L (brightest lines in frame). ℓ → 0 (opaque paint) ⇒ premise collapses. [your failure condition #1] R₂ ZONE‑SPECTRAL DISTINCTNESS [::5] ∀ zone z : one CONCEALED practical, CCT_z = f(function(z)); pairwise Δchroma(CCT_z, CCT_z′) > τ ⇒ the building reads as a SECTIONED LANTERN; interior lit ONLY from within (no external fill into rooms; no visible LED hardware). all CCT equal ⇒ uniform glowing lump. [your failure condition #2] R₃ SHADOW‑SCREEN LEGIBILITY [::4] interior occluders sit between practical and wall ⇒ each wall is a projection screen; silhouette contrast preserved ⟺ scattering blur σ_s(ℓ)
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