"Light Shaft" diagonally crosses the screen with a wedged light formation, usually on the diagonal. Its variations are rendered through arrangements of the tripod while panning the camera. Limiting the viewer's attention to a smaller screen, a point in space, allows for a certain confusion as to whether the rest of the (dark) screen blends itself into the surrounding blackness or is just a window ino it.
This is more apparent when the "wedged light" goes out of the frame. It can be felt as if crossing the room; and it reappears at the opposite end of the frame. Sometimes it just makes a turn and comes back. The form and size of the light are influenced by movements of other objects, thereby shifting the impressionof materiality between itself and its edges. (VG)