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I like the thought that I am going to look like Jedi using the Force to tell my iPad what music to play. Finally, all that practice trying to use my Jedi powers when I was eight years old is going to pay off! Really, though, a version of this is already here. Just last night my kid was playing his X360 with Kinect, and he was controlling it entirely using hand/arm movements, so in a way the technology is already out there and in use. The Kinect uses camera facing the user, and the location of the person playing is important for the system to properly “read” the gestures. It doesn’t seem like too much of a leap to use the camera of a smartphone to do the same thing, although it would need some pretty sweet tracking technology to avoid the need of very carefully positioning oneself in the “sweet spot” for the camera of the device for it to recognize what the heck you are flailing around about.