The chid is the house people in the Pamirs still live in: stone and mud-plaster walls, five named wooden pillars, and a ceiling that steps inward through four rotated square frames to one small opening. That assembly is the chorkhona — "four houses" — read as earth, water, air and fire climbing toward the rauzan, the room's only source of daylight.
This system takes the room literally. The page is soot-darkened poplar. Light arrives from a single point overhead and falls off toward the corners. Red and white appear the way they appear on a real beam — small, symbolic, never the ground.