Omer Yosha's Airpiano is very similar to the famous Theremin invented in Russia around the year 1919.
"The theremin is one of the earliest electronic musical instruments, and the first musical instrument played without being touched," Wikipedia explains.
The major difference between the Airpiano and a therepin is that while the theremin mimics a symphony conductor, the AirPiano plays like a piano, and is obviously more advanced than the theremin.
Music is created without even touching the keys, and simply hovering over it with a hand allowed the tone to carry out.
The secret to this, according to creator Omer Yosha, is a virtual matrix of faders and keys that correlate with MIDI instructions. The latter is fed to and interpreted by software such as the high-end Ableton LIVE. I really don't know what that means but it sounds smart.
Anyway, this is a great invention if its not a total hoax. Watch the video so you can appreciate it for yourself.