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digital sundials
http://www.biol.rug.nl/maes/genk/en/gk-zw08-e.htm
(And no, it doesn't have anything to do with fingers. Although that might be cool, too. ("Why do you call it a digital sundial?" "Take a closer look at the gnomon...."))
(And no, it doesn't have anything to do with fingers. Although that might be cool, too. ("Why do you call it a digital sundial?" "Take a closer look at the gnomon...."))