aperiodic tiling
Aperiodic_tiling
http://www.uwgb.edu/dutchs/symmetry/aperiod.htm
Penrose Tiles
“Penrose's second set is usually known as the kite and dart.”
http://www2.spsu.edu/math/tile/aperiodic/penrose/penrose2.htm
“Penrose's third aperiodic set is known as the Penrose rhombs.”
http://www2.spsu.edu/math/tile/aperiodic/penrose/penrose4.htm
Wang's tiles (cf. Wang's Carpet)
category geometry