Take a balmy evening walk through Downtown Pittsburgh to see the city's glowing collection of light-based public artwork. Participants will experience six artworks such as "The Puddler," a neon light piece from the 1930s; "Cell Phone Disco," an interactive work in Tito Way by the artist collective Informationlab; and "For Pittsburgh," an LED artwork on the roof of the David L. Lawrence Convention Center by artist Jenny Holzer.