This one’s a bit hard to explain, it’s best that you just watch the video real quick.
Using accelerometers, vibration motors, and sound, a mobile device can convey it’s contents to you through tactile and audible feedback. So if you get an e-mail, that e-mail is represented as a metalic ball in the device. Shaking the device makes the ball bounce around, producing sound and vibrations. Multiple messages cause multiple sounds, and different senders can create different tones.
It’s not completely practical as presented… I can’t imagine walking around with unread e-mails, making jingling sounds, but to me, the concept is extremely strong.
Via: Engadget Mobile