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Re:Discovery of a new irregular pentagon that can cover the ... by ab on Wednesday August 12, 2015 @04:10AM (#10046672)
It's interesting how your eye naturally groups the pentagons into the larger primitive unit, like the pinwheels of type 5.

Wolfram Alpha also has some things about tiling: http://www.wolframalpha.com/input/?i=pentagon+tiling http://www.wolframalpha.com/input/?i=pentagon+type+5+tiling

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