by Lauren R. of Glasgow, Scotland
Lauren's tortoises' shells extend from the neck at left to the neck at right, above the head of each tortoise behind another.
Why do turtles put up with that? It looks painful, like a turtle dragging a caravan. Lauren's tortoises seem quite happy about it, though. It must be a thing that only turtles and tortoises understand.
Their little feetsies are nicely defined, and the overall effect is like a legion of happy BOJ wind-up brass turtle hotel bells.
This tessellation repeats purely via the translation (slide) method: the turtles don't lay on their backs, which I hear is fatal for turtles and tortoises, and they don't head in any direction except left. You know-- like American Democrats.
This tessellation is a clear example of the "TTTT" type in the Heesch tessellation classification system. That means, each turtle "tile" touches four other turtle tiles (that's why there are 4 "T"s); also, all the turtles are pointed in the same direction and at the same angle.