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Retweet of doctorow
2016 Feb 8, 5:08
A digital, 3D printed sundial whose precise holes cast a shadow displaying the current time
https://boingboing.net/2016/02/09/a-digital-3d-printed-sundial.html …
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A digital, 3D printed sundial whose precise holes cast a shadow displaying the current
time 
Some rights reserved