Fol Chen has joined forces with Monome and Machine Project to bring you the Tetrafol.

The Tetrafol is a hand-held tangible electronic sound toy. Circuits enclosed by a wooden tetrahedron detect orientation and motion-gestures to modify the playback of a collection of Fol Chen's micro-compositions, allowing the user to explore sound through physical manipulation.

The battery-powered device has its own internal speaker but can additionally be hooked up to a headphone or amplifier.

The circuit and firmware are based on open-source hardware and is itself published as open-source, allowing anyone interested to learn about its deepest inner-workings.

Buy one here:
http://machineproject.com/archive/other/2011/11/07/announcing-the-tetrafol/