Using motion sensors, sound equipment, and an aquarium full of goldfish, artist Henry Chu created what he calls a Fish Harp.
The Fish Harp is comprised of an aquarium filled with goldfish with a sheet of clear glass covering the top. A variety of different glasses filled to various levels of liquid sit on top of the glass sheet. Above each glass is a motion sensor that senses when a fish swims underneath it. When the motion sensor registers motion under a given glass (i.e. a fish swam underneath it), it triggers the sound system to play a given wine glass note.
Sit back and enjoy: