Many objects in nature and industry are enclosed in protective wrappings. A liquid drop on a thin sheet (~60 μm) can wrap itself up, by balancing surface tension with bending forces . Here, we place an ultrathin (79 nm) circular polystyrene sheet on a water drop that is immersed in oil. The volume of the drop is controlled by a needle inserted from below. As the radius of the drop is reduced, the sheet forms wrinkles, crumples , and folds. These patterns form when the cost of bending is much smaller than surface energies. Folds can grow quasistatically, or they can propagate at a finite speed.
 Py et al, PRL 98, 2007.
 King, Schroll, Davidovitch, & Menon, PNAS 109, 2012.