Open Air by Rafael Lozano-Hemmer is an interactive art installation designed to transform Philadelphia’s historic Benjamin Franklin Parkway, between September 20 and October 14, 2012.
In this project, twenty four powerful searchlights create unique, dynamic light formations in the sky which react to voice messages sent by participants using a free mobile app and this website. The public is invited to record and submit messages of up to 30 seconds in length — shout-outs, poems, songs, rants, dedications, proposals. As the messages playback in Philadelphia, the lights react in brightness and position to the frequency and amplitude of the voice recordings, which can be heard through the mobile app, the website and public speakers located at the Project Information Center at Eakins Oval
More at: http://openairphilly.net/concept