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Pictures of surface gravity waves observed on silicon oil in a cylindrical container that is vibrated vertically. Wave-crest patterns alternate between starlike (left) and pentagonal (right) shapes at increased vibration amplitude. Selected for a Synopsis in Physics. [Jean Rajchenbach, Didier Clamond, and Alphonse Leroux, Phys. Rev. Lett. 110, 094502 (2013)] |
