I wonder what it would be like to combine Google Glass with the Leap Motion Controller?
The "Google Glass" glasses could launch apps on voice activation (as I believe they do now), with some programs responding to motions as captured by a motion controller mounted on the bridge of the glasses.
For example:
By voice activation a user could launch a "Piano game" from the glasses, and then play the keys on any surface as detected by the motion controller.
Tim Montague
7-16-2013