REACTABLE- a Table Instrument?!

This video is a lesson on how to use the reactable. There are a bunch of live performance footage on YouTube.
This table is a collaborative electronic music instrument with a tabletop tangible multi-touch interface. Several simultaneous performers share complete control over the instrument by moving and rotating physical objects on a luminous round table surface.
The instrument was developed by The "Interactive Sonic Systems" team under the direction of Dr.Sergi Jorda.

Look at this site if you want to know more. http://reactable.iua.upf.edu/