Imagine standing in front of a geometric black and white painting with a repeating pattern, a zigzag for example, and wondering why it attracted your attention. At first you do not understand, but as your eyes examine the paintings surface you will start to see movement in there. You do not believe your eyes since it is only paint on a canvas, or is it a trick? No, this is what meeting an early Bridget Riley painting is like. The Gemeentemuseum in The Hague currently houses an exhibition where you can experience this for yourself.