One of the biggest surprises of the upcoming Live Arts Festival this September will be one seen by everybody in Philly—not just ticket holders. Every night, from September 20th until October 14th,Open Air, a major visual art installation, will light up the skies, created by a series of high-powered searchlights installed on a half mile stretch of Benjamin Franklin Parkway. Download the right app and call in, and the lights will not only dance to the sound of your voice, but they’ll change their layout so that you, from where you’re standing, will have the best view.

(via A Few Questions With Rafael Lozano-Hemmer, Creator Of Open Air)