IT'S A FISH EAT FISH WORLD by Marc
Fish are one of the most popular themes for tessellations. Escher did dozens. Why? Well, they're colorful, flexible, and come in an amazing variety of shapes.
In Marc's world, the most important thing about fish is that they're HAAWWWNGRYYYYY. :^)
In this tessellation, can you see the shape Marc started with? It's an equilateral triangle. Six of them, rotated (in a "rotational symmetry" tessellation) form a hexagon.
Hexagons tessellate; triangles tessellate. And so, apparently, do hungry cannibal fish.