John Rogers, of the University of Illinois at Urbana-Champaign, has created a sheet of silicon that can stretch in two dimensions. To do this, he affixed a sheet of silicon a few hundred nanometers thick to a rubber sheet that's stretched in all directions. After the strain on the prestretched rubber is released, the silicon buckles to form waves and herringbone patterns that enable the rubber and silicon to be stretched again. This video shows the formation of the wavy structures in a thin film of silicon.