the other day I had this idea: using the camera, combined with some kind of printed gradient background that could be rolled up and carried around, with two smartphones or tablets, attached with a harness to each wrist? by the phones "knowing" where they are against the background, and in relation to each other, just about any musical instrument could be simulated: piano and guitar for sure, perhaps even sax and trombone. the rolled, printed background could be fixed to one hand and rolled by a spring on the other in the case of something like a trombone or guitar, and laid flat for a piano.
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