The Swings: An Exercise in Musical Cooperation from Daily tous les jours on Vimeo.
"Each of the individual swings makes a sound when rocked back and forth. When each swing is occupied, the installation can compose a musical piece, stringing together each tone as different users move. Some tones are only achievable with user cooperation, creating a bond between the people enjoying the swings. Users can also work together to manipulate the sounds, relying on team work to create a a special tune."
The Swings: A Musical Swing Set that Illuminates & Plays Harmonies as People Swing! | Inhabitots