THE RAYY's unique method for sculpting light was developed at Mark Pauly's Geometric Computing Laboratory
, at EPFL
. Romain and Yuliy were studying caustics, or the way light rays reflect off one surface to form patterns on another. Although you may not know the word, you know the effect. It is what you see when you look at the bottom of a swimming pool – or next to a glass of water – on a sunny day.