In this preview from the "Art in the Twenty-First Century" Season 6 episode, "Change," artist Ai Weiwei discusses his 2006 work, "Surveillance Camera."

"Change" premieres Friday, April 13, 2012 at 9:00 p.m. ET on PBS (check local listings).

For more information on Ai Weiwei, please visit:
art21.org/artists/ai-weiwei

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