Arizona Science Center
ARIZONA SCIENCE CENTER IN PHOENIX, ARIZONA
A public space in front of the Arizona Science Center in Phoenix was implemented in 1997 and features five outdoor sculptures that are designed to create harmonic musical sounds as they spin in the wind. Promoted by local authorities, it is a permanent installation, attracting residents and tourists on a regular basis. Designed by Mary and Bill Buchen (Sonic Architecture) .
Arizona Science Center’s Sun Catchers 
This park features a pedestrian path set diagonally, along which five "sun catchers" are placed at a regular distance of approximately eight to nine meters. Each sun catcher is tuned to a different tone of the pentatonic scale, each contains a propeller, which activates a mallet by the action of the wind, which then strikes the tuned tubular bell. There is also a glass prism that changes colour. The propeller and piston mechanism is designed so that the piston randomly skips mallet hits in order to create periods of silence and increase diversity and unpredictability of the achieved sound environment.
Entry submitted by: Xiaochao Chen