A public art project by Cai Guo-Qiang: "Fireflies invites the public to actively experience the grand boulevard as a nocturnal dreamscape conjured from the languorous movements of bobbing clusters of glowing handcrafted Chinese lanterns and groups of customized peddle vehicles. Nine hundred illuminated lanterns in a bevy of colors and shapes will float along the Benjamin Franklin Parkway, held aloft by a fleet of 27 pedicabs." The rides are free, and at night.