You've probably been to a playground, but have you been to the Geometry Playground? It's just as much fun, and it may change the way you think about geometry. Created by the good folks at the Exploratorium in San Francisco, this exhibit is meant to complement the traveling exhibit which has been featured in other science museums around the United States. The exhibit here contains three sections: Seeing, Moving, and Fitting Things Together. In the Seeing exhibit, visitors can make their way through a fine photo essay about the invisible geometry of light, while the Moving section gets interested parties up and exploring geometry with their bodies. Each of these sections has great photo essays, complemented by animations and fun activities.