That’s a musical keyboard, not the computer input device. This interesting use of the Kinect camera allows for one to place a musical keyboard pretty much anywhere at all.
Check out the video above and you’ll see what I mean. When you think about it, this isn’t anything too particularly special. Just an impressive demonstration of defining areas of interactivity within a 3D space. But it scores massive bonus points for making it easier to recreate that amazing piano scene in Big with actually having to find (and then possibly dispense with) a giant keyboard.
Now, if you want Gene Hackman, that’s another matter entirely.