octagonal symmetry. The decagonal covering of the Penrose tiling was proposed in 1996 and two years later Ben Abraham and Gähler proposed an octagonal variant for the Ammann–Beenker tiling. Ammann's name became that of the perennial second. It is acknowledged however that Ammann first proposed the construction of rhombic prisms which is the three-dimensional model of Shechtman's quasicrystals. References External links Ammann tilings and references at the Tilings encyclopedia Amateur mathematicians Recreational mathematicians 20th-century American mathematicians 1946 births 1994 deaths Brandeis University alumni