labtastic

www.youtube.com/watch?v=0h-RhyopUmc&eurl=
he reactable, is a multi-user electronic music instrument with a tabletop
tangible user interface. Several simultaneous performers share complete
control over the instrument by moving physical objects on a luminous table
surface. By moving and relating these objects, representing components of a
classic modular synthesizer, users can create complex and dynamic sonic
topologies, with generators, filters and modulators, in a kind of tangible
modular synthesizer or graspable flow-controlled programming language.