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.
From the article:
Observation of Star-Shaped Surface Gravity WavesJean Rajchenbach, Didier Clamond, and Alphonse Leroux
Phys. Rev. Lett. 110, 094502 (2013)
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