Spontaneous folding of an elastic sheet around an evaporating water droplet. See article 156103 and Physical Review Focus story at

From the article:

Capillary Origami: Spontaneous Wrapping of a Droplet with an Elastic Sheet
Charlotte Py, Paul Reverdy, Lionel Doppler, José Bico, Benoît Roman, and Charles N. Baroud
Phys. Rev. Lett. 98, 156103 (2007)

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