Penrose Tiling

This is how you know you're in a mathematician's house. The bathroom floor is tiled with a Penrose tiling. (The Penrose tiling has two distinct features--first, that it's aperiodic. Second, that it's made with two basic shapes.)

 

(There is actually one small error in this tiling. Can you spot the error?)

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Taken on October 20, 2007