Nonperiodic tiling
From Bwtm
Penrose Tiles http://www.uwgb.edu/DutchS/symmetry/penrose.htm
Steven Dutch, Natural and Applied Sciences http://www.uwgb.edu/DutchS/symmetry/symmetry.htm
links
Penrose tile floors. http://blog.makezine.com/archive/2011/01/penrose_tile_floors.html#more