Tessellating in the rain

Giant's Causeway Maths building, QMUL

On the left, the Giant’s Causeway in Ireland: a periodic tessellation of the plane by hexagons (with some imperfections), made of basalt.

On the right, the Mathematics building at Queen Mary, University of London: a non-periodic Penrose tiling, made of plastic.

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About Peter Cameron

I count all the things that need to be counted.
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