cloud piano from david bowen on Vimeo.

This installation plays the keys of a piano based on the movements and shapes of the clouds. A camera pointed at the sky captures video of the clouds. Custom software uses the video of the clouds in real-time to articulate a robotic device that presses the corresponding keys on the piano. The system is set in motion to function as if the clouds are pressing the keys on the piano as they move across the sky and change shape. The resulting sound is generated from the unique key patterns created by ethereal forms that build, sweep, fluctuate and dissipate in the sky.

[Via: Laughing Squid)