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I think these were mentioned here earlier but they are almost a reality at this point https://www.leapmotion.com/ And $80 is pretty dirt cheap for this kind of thing I think (if it really works as advertised) Just think of what you could do with one of these mounted to an instrument. Kevin -- Till now you seriously considered yourself to be the body and to have a form. That is the primal ignorance which is the root cause of all trouble. - Ramana Maharshi (1879-1950)