Bubbles stabilized in hydrophobic frames in the shapes of the five Platonic solids. The bubbles are trapped when the frames are immersed, with roughly flat interfaces at the openings.
From the article:
Polyhedral Bubble VibrationsMariem Boughzala, Olivier Stephan, Emmanuel Bossy, Benjamin Dollet, and Philippe Marmottant
Phys. Rev. Lett. 126, 054502 (2021)
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