From the hallowed pages of Future Music, this story:
“The silver Tenori-On looks like a small tablet PC with a 16×16 grid of white LEDs. The lights can be seen from both the front and the back of the unit, so an audience can take part in the visual fun as well. The Tenori-On is meant to be programmed both musically and visually. In fact, you can program the music, and then go back and program a customized visual sequence to complement what you’ve composed.”
So the thing can be played as if you were designing with your fingertips, or it can be played by just knowing what notes are where on the instrument, and it has built-in speakers. Rad, or what?!