Bonnie Eisenman, an engineer, recently took a course on electronic music. She felt inspired to make a unique instrument. The result of her efforts is the Illumaphone, a light-controlled electronic instrument.
It consists of 6 coffee cups with light sensors inside. Each one plays a different pitch. As she moves her hands over the cups, the differing light levels measured by the sensors adjust the volume and vibrato.
-via Hack A Day