PSyBench is a general platform for creating distributed Tangible Interfaces for collaborative design.
Objects on an augmented tabletop are physically synchronized with identical objects on a remote table, allowing distant users to cooperatively manipulate a shared physical space.
PSyBench is a part of the "Tangible Copresence" project which enhances distributed collaboration and communication based on the idea of Tangible Interfaces. The key concept is "Synchronized Distributed Physical Objects."
(Source: http://tangible.media.mit.edu/projects/psybench/)