Humans are masters of making difficult cognitive tasks easier by using their hands to structure the environment. Think of how you might arrange objects you need to take with you by the door or make a pile of edges pieces in a jigsaw puzzle. EventTable is a tangible tabletop prototyping platform which allows us to investigate how supporting users' direct physical interaction with embedded computational environments can support spatial problem solving. Instead of using a mouse and cursor to move digital objects. EventTable allows users to directly move computationally augmented physical objects. Prototypes built on EventTable include touch and tangible jigsaw puzzles for children, a tangible concept mapping tool, and a sustainability simulation for children.