Tenori-On

Tenori-on is an electronic musical instrument, designed and created by Japanese artist Toshio Iwai and Yu Nishibori of the Music and Human Interface Group, Yamaha Center for Advanced Sound Technology. It consists of a screen, held in the hands, of a sixteen by sixteen grid of LED switches, any of which can be activated in a number of ways to create an evolving musical soundscape.
The best "Toy" i've seen in a while and i totally want it!!!!