Venice Biennale '13; James Turrell

Director of the 2013 Venice Biennale Massimiliano Gioni and U.S. artist Sarah Sze talk about the history of the Biennale and this year's exhibition, "The Encyclopedic Palace." Artist James Turrell reflects on his preoccupation with light as an artistic medium and describes his latest installation at the Guggenheim, "Aten Reign."