Watch art21 Season 1 Online

Sculptor Richard Serra, "street artists" Margaret Kilgallen and Barry McGee, photographer Sally Mann and installation artist Pepon Osorio. Serra, seen installing one of his massive steel-plate structures in the atrium of an office building, needs a big place for his works. McGee and Kilgallen make gallery art but prefer grafitti. Mann, known for nude photos of her children, is now doing landscapes. And, says Osorio: "I need to create a space. That is overpowering."