Brooklyn artist D.Billy has created several site-specific installations around the city using balloons as his primary medium. He writes: Using colorful media such as twisting balloons, party streamers, and artist tape, I have begun to add visual representations of sound effects to public spaces as a sort of dimensional graffiti. After embellishing the found scenes and photographing the results, I leave my additions in place to engage passers-by for as long as the materials hold ...