Interesting site Quote from Cloud Harp; "On a technological point of view, the Cloud Harp; also known as the Keplerian Harp, after the German astronomer Johannes Kepler, is similar to a giant CD player turned upside down"... "the small laser beam is replaced by a large infrared one; the lens is replaced by a telescope; the role of the compact disc is played by the cloud itself."

http://www.cloudharp.org/  ¶ 8:22 PM