human
Compose a short description of a dark cave with a cleft in the wall and a few beams of light flickering in from outside.
assistant
The cleft opens into a wide passage that arches dark and smooth overhead. A few beams of ambient light flicker in from just outside, but are quickly quenched to wavering threads, as though the passage itself forbids their presence. The sand of the canyon floor gives way to finer silt, and cool, faintly sour air drifts in from somewhere in the darkness beyond.