In this undated photo released by Rio Film Festival, performance artist Marina Abramovic works during the making of the documentary film "The Artist is Present" in an unknown location. The Belgrade-born artist is best known for her piece "The Artist Is Present," which in 2010 saw her sit silent and motionless for 736.5 hours opposite a parade of strangers at New York's Museum of Modern Art. The film is playing at the 2012 Rio de Janeiro International Film Festival. (AP Photo/Rio Film Festival)
