

A dim prison corridor stretches away under a hanging caged lamp, its wet concrete floor catching green and amber reflections. Three square framed panels on the walls hide the finder squares, while the dark objects bolted along both sides and scattered on the floor carry the modules. Strong contrast between the black shapes and the pale wall surfaces keeps the pattern legible through the haze. A small glowing bulb at the far end pulls the eye down the corridor like a movie still.