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Artist Michael Heizer walks past his sculpture "Levitated Mass" prior to a dedication ceremony featuring a 340-ton granite boulder sitting above a 456-foot-long concrete slot at the Los Angeles County Museum of Art in Los Angeles, on Sunday June 24, 2012. Thousands showed up under sunny skies as the gigantic work titled "Levitated Mass" was unveiled Sunday on the museum’s rear lawn, where it is intended to remain forever. (AP Photo/Richard Vogel)

Associated Press
Artist Michael Heizer walks past his sculpture  "Levitated Mass"  prior to a dedication ceremony featuring a 340-ton granite boulder sitting above a 456-foot-long concrete slot at the Los Angeles County Museum of Art in Los Angeles, on Sunday June 24, 2012. Thousands showed up under sunny skies as the gigantic work titled "Levitated Mass" was unveiled Sunday on the museum’s rear lawn, where it is intended to remain forever. (AP Photo/Richard Vogel)
Artist Michael Heizer walks past his sculpture "Levitated Mass" prior to a dedication ceremony featuring a 340-ton granite boulder sitting above a 456-foot-long concrete slot at the Los Angeles County Museum of Art in Los Angeles, on Sunday June 24, 2012. Thousands showed up under sunny skies as the gigantic work titled "Levitated Mass" was unveiled Sunday on the museum’s rear lawn, where it is intended to remain forever. (AP Photo/Richard Vogel)
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