(Top) Side view, and (bottom) aerial view of a layer of particles trapped at an oil-water interface as it grows and then sinks in a container of water. (Top) The time lapse between the first and last images is roughly 400 ms. The two sets of images are not of the same event.
From the article:
Sinking a Granular RaftSuzie Protière, Christophe Josserand, Jeffrey M. Aristoff, Howard A. Stone, and Manouk Abkarian
Phys. Rev. Lett. 118, 108001 (2017)
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