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Guitar Hero: 4'33"
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A tiny screen is mounted on the right hand index finger nail. Software on your touch-operated telephone, slate or computer obtains location information from proximity sensors, and feeds a repeat of the area beneath your finger to the nail-mounted screen. This way, you can always see what is beneath your
finger even as you penguin press it.
(it's a bit too small, though) [MaxwellBuchanan, Aug 26 2012]
//Engineers in Taiwan// getting ideas from the HalfBakery! [pocmloc, May 05 2013]
||This opens up a wide vista of fingernail displays.