These fish are schooling, and in their frenzy form a special formation. The tessellation is made from a single tile design, and appears in mirrored as well as regular orientation. Two different shadings, and 3 colours, create two interlocking figures, dark and light, a figure known as the Gosper Flowsnake. The fish have a bright lateral line, this line traces out the plane-filling Gosper curve, from the lower left to the lower right. The fish inhabit a watery universe which has two flows of dark water and light water, the dark and light swirls grow out of these bodies of water.
The version shown is the aluminium version in golds and reds. A detail of the paper print version in greens and blues is below.