We all know that when using a computer, a keyboard and mouse are pretty much the only way of interacting with the system.
So what happens when someone tries to think beyond these two devices and come up with a new way of intuitively interacting with computer systems?
The answer, I think, could be something like this. Here, Jeff Han from the New York University Courant Institute of Mathematical Sciences demonstrates for the first time his fingertip driven touchscreen UI. Check it out, it's really neat.