A Ritual Chamber film still, high oblique from a dark control booth: a private Linux desktop is rebuilt as a sealed test chamber under laboratory glass, browser tabs, files, task cards, and credential silhouettes arranged like furniture for a computer-use agent. Large empty walls carry the cream-and-dark stepped-cross institute tile; deep near-black, hard chiaroscuro, clear analogue tube-amp warmth. One cobalt grade; the single accent is a few phosphor-green status tubes beside the glass. A hexagonal honeycomb lattice is the real floor under the desktop surface; one small mis-struck Bureau seal. Numbered callouts: (1) context file, (2) credential shadow, (3) task card. One detail gone quietly wrong: the cursor has a chair. Nobody is afraid. Output in exactly 1122 x 1402 px, 4:5 portrait ratio.