There are lots of cool instruments that can be played but normally you are limited to enjoying one at a time. Patrick Flanagan has that concept licked with his Jazari Musical Instrument. He is able to control an entire room full of instruments by creating loops on them using his unusual looking hand interface. It uses accelerometers to detect the position of his hand and adjusts the instruments sound accordingly. Using his fingers he is able to switch between instruments. This approach allows him to build layers of instruments until they are all playing in perfect rhythm. The sound is soothing and vastly different than anything else I have ever heard. You can also have fun with this Android app to play a vocal instrument that sounds very cool.
Thanks for the tip Jay.