This experiment was initiated by the Rochester Cloak project created by Professor John Howell and graduate student Joseph Choi. It uses 4 lenses to control light in a way that renders an object invisible. When the light enters the lenses, the images you get differ depending on the lense they come through. The light is essentially bending around the object which allows the background image to pass through all of the lenses without warping or being seen as upside down.