In Diffraction, a small bright light is mounted behind a hole in a darkened wall. When looking at the light, it seems to twinkle. This effect is caused by the bending of light in the eye and its lens. This same diffraction effect is observable in other objects by using the various props at the exhibit. A diffraction grating bends the light enough to produce rainbow effects. There are also some common objects, like a piece of screen, which afford a view of the diffraction patterns caused when light bends around edges.