The reactable is a state-of-the-art 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.

If that sounds like a bunch of mumbo-jumbo, just check out the videos below:

Basic Demo #1

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.

Basic Demo #2

Improvisation Demo

This instrument is being developed by a team of digital luthiers (Sergi Jordà, Martin Kaltenbrunner, Günter Geiger and Marcos Alonso), at the Music Technology Group within the Universitat Pompeu Fabra in Barcelona, Spain.

via Axehole: Reactable - A Multi-User Electro-Acoustic Instrument