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The Violina plays music on the very edge of the chalice on the gold rim. It's named after
a mechanical violin playing instrument from about 100 years ago.
It uses a big circular bow made out of Mongolian horse hair to bow around it -- much like the
bow of a violin. We didn't know we'd be able to make a machine
that was sensitive enough to bow the edge of a glass, so we've got a bunch of software
that looks at the amount of current being drawn by the motors to get the touch just right.
When you really sweat the details
you can make something amazing.