The action of wind and water can form cave openings like natural rooms within the rock.
VOA: special.2009.07.20
The dripping of water resonates around the cave, and I'm reminded of Axel's words in Journey to the Centre of the Earth: 'I had not yet peered into the fathomless pit into which I was about to venture.
One thing's clear, however: The artist purposely chose to position each image above a protruding ridgeline that runs along the cave wall, symbolizing either the surface of the water or tall grass that's obscuring the lower half of the deer.