An object that’s intrinsically flat, say a piece of paper, can be shaped into a cylinder without stretching or tearing it. The same isn’t true, however, for something intrinsically curved like a contact lens. When compressed between two flat surfaces or laid on water, curved objects will flatten, but with wrinkles that form as they buckle.
Click here for original story, When curved materials flatten, simple geometry can predict the wrinkle patterns that emerge
Source: Phys.org