Check out this Sound Responsive Dress which listens to the singers voice and adjusts accordingly. In the picture below you can see the electronics that run the dress mounted to the wall.
Thanks to Mitch for sending this in.
“It’s a sound-responsive dress that uses Processing (heavily using the Minim code library) and Arduino to map the singer’s voice onto an array of spinning strings. The strings, in turn, tug and pull at the singer’s dress.
In the attached photo, you can see the microphone in the foreground. Then, moving down the wall of electronics, you’ve got the Arduino and transistor array, the power source, a netbook running the Processing sketch, and finally a small mixer board.”