This image could be a close-up of the rippled back of a tiger shark or a two-spined zebra, with dots instead of stripes. It isn’t a huge leap to see a bony ribcage pattern beneath a stretched, leathery hide. It could also be a series of ink blotches splattered in a Rorschach test gone wrong. What we’re actually seeing is a satellite image of sand dunes on Mars taken on a summer afternoon. Even when we know its context, this image challenges us to look more deeply, inviting comparisons to art.