[Image: The surface of the earth peeled away to reveal rock and fissures – a perfect excuse for one of my favorite quotations: “Look down well!” Jules Verne once wrote. “You must take a lesson in abysses.” Image produced by R.C. McDowell, G.J. Grabowski, and S.L. Moore for the U.S. Geological Survey; this is Kentucky. An alternative map, by A.C. Noger, is no less topo-optically extraordinary].