Cellular Structures from Superposition of Waves
A superposition of linear waves propagating at different angles exhibits cellular structures. The and cases correspond to the symmetry of a quasicrystal.
 J. Mikhael, J. Roth, L. Helden, and C. Bechinger, "Archimedean-Like Tiling on Decagonal Quasicrystalline Surfaces," Nature 454, 2008 pp. 501–504. doi:10.1038/nature07074.