Voice Cloud creates a social atmosphere in an otherwise dark room by responding colorfully to the sound of your voice. It provides visual feedback to the frequencies it hears, whether spoken, sung, or played back from a recording. When installed in the library of Stanford’s design loft, Voice Cloud created a mood in which uninhibited exuberance became mainstream – from guitar playing to singing, participants felt entirely open to interact with it on their own terms. Created with Arduino, PureData (based on MaxMSP) for sound processing, and an analog circuit driving RGB LEDs.