BIRDS by Simon
Birds is very satisfying as a tessellation, because it has a strong sense of both art and engineering.
It's clearly representational, like a good Escher-style tessellation should be. Bird shapes are a favorite motif amongst Escher-style tessellation artists. The silhouette of a single bird "tile" strongly suggests "bird", even though these birds are a bit angular. The angularity, though, lets us also see this as almost an abstract geometric tessellation.
We're also confronted by not one but two kids of tessellation symmetry. If we look at any point where four heads meet, we're clearly looking at rotational (spin, turn) tessellation symmetry. Each bird-shaped tile is a copy of another, rotated 90 degrees around that point where four heads meet. However, if we look at a grouping of 4 birds, it looks a bit like a large plus (+) or cross shape. That plus shape is repeated horizontally and vertically without rotating-- which makes Birds a translational (slide) tessellation too.