Describe the Marabar Caves.

In Part II, Chapter XII, we learn that each of the caves includes a tunnel about eight feet long, five feet high, three feet wide that leads to a circular chamber about twenty feet in diameter. Having seen one cave, one has essentially seen all of them. A visitor who sees them returns to Chandrapore uncertain whether he has had an interesting experience, a dull one, or even an experience at all. In one of the caves there is rumored to be a boulder that swings on the summit of the highest of the hills; this boulder sits on a pedestal known as the Kawa Dol.