hey anima!!
verry cool stuff ;) the guy who make this is dr sergi jorda with students of the univeristy pompeu fabra in barcelona spain ;)
actually the reactable is a multi-user electro-acoustic music instrument with a tabletop tangible user interface. Several simultaneous performers share complete control over the instrument by moving physical artefacts on the table surface and constructing different audio topologies in a kind of tangible modular synthesizer or graspable flow-controlled programming language ;)

you can check the audiopad table create by jammes patten is similar but with more info on the physical artefacts;)))) www.youtube.com/watch

boom&peace

multi touch technology is the future of making alot of stuff
www.youtube.com/watch

that's great! i wanna play!