To defrost from a long Arctic Vortex and to draw mangroves in charcoal I flew to an artist colony near Fort Myers, Florida, on an elongated and thin island, a Key. I didn't know there were Keys on the West Coast of Florida, only south of Miami, where I had never been. It seems a Key is a glorified sandbar which has gained solidity through vegetation sinking roots and tides bringing in more sand, mostly white but with specks of black. Some of the black came from thousands of years of shark teeth, and every morning I could see people collecting the teeth. It was an art form.