This striking organic design could be an abstract painting. It’s dominated by a circular central section, like a one-celled organism with blue, green and yellow patches in its nucleus. Artful swirls of paint radiate outward from its edges, scarlet at the top, more muted greens and browns in a field of peachy orange around the sides. The entire, vaguely sunburst-like shape seems to float on a ground of pale pink. This is actually a geologic map of the deepest lake in the United States, Crater Lake in Oregon, formed by the collapse of a volcano about 7,700 years ago.