Brain coral is named for its winding grooves, which do look a great deal like a brain and have never once been used for thinking. Some colonies live for centuries. The Teal Brain Coral is a glazed ceramic dome, 5.5 inches wide and 3 inches deep, covered in long, looping ridges shaped by hand, so no two pieces wander in quite the same way. The teal glaze settles darker in the grooves and lighter on the ridges, which draws the pattern without a second color. It hangs on one screw. It has no opinions, though it looks like it might.