Editing Platonic solid (section)

=== Liquid crystals with symmetries of Platonic solids ===
For the intermediate material phase called [[liquid crystal]]s, the existence of such symmetries was first proposed in 1981 by [[Hagen Kleinert|H. Kleinert]] and K. Maki.<ref>Kleinert and Maki (1981)</ref><ref>{{cite web |title=''The liquid-crystalline blue phases'' (1989). by Tamar Seideman, Reports on Progress in Physics, Volume 53, Number 6 |url=http://chemgroups.northwestern.edu/seideman/Publications/The%20liquid-crystalline%20blue%20phases.pdf}}</ref>
In aluminum the icosahedral structure was discovered three years after this by [[Dan Shechtman]], which earned him the [[Nobel Prize in Chemistry]] in 2011.