A Ritual Chamber silver-gelatin production still, 4:5 portrait: in a cobalt-black institute chamber, a single black search apparatus stands on a physical hexagonal floor lattice. Its small brass query bell is raised on a thin arm, paused before three sealed paper corridors; green #22c55e tubes form one concentrated accent band along the rear wall. A gloved back-view technician is barely visible in shadow. Institute tile inset on the far wall; hard directional light, deep near-black shadow, clear analogue tube-amp warmth. Numbered callouts indicate ambiguity sensor, clarification bell, and unopened result spool. One corridor bears a quietly wrong child-sized doorknob. Bureau seal struck once lower right. No caption text. Output in exactly 1122 x 1402 px, 4:5 portrait ratio.