Fig. 1 — Superposition of room-mode interference fields at frequencies derived from a 4.70 × 3.81 m clinical consultation room (ICD transition audit, 1975). Luminance fringe periods at registration marks encode reclassified case-rate differentials per 100,000. Decode by measuring fringe spacing (mm) at crosses A–H on printed copy. α-channel parity encodes auxiliary index. Identical geometry, different nomenclature: both rooms resonate identically.