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Visitors take photos of Michael Heizer’s "Levitated Mass" at the Los Angeles County Museum of Art in Los Angeles, on Sunday June 24,2012. Thousands showed up as the gigantic work was unveiled on the museum’s rear lawn, where it is intended to remain forever. (AP Photo/Richard Vogel)

Visitors take photos of Michael Heizer’s "Levitated Mass" at the Los Angeles County Museum of Art in Los Angeles, on Sunday June 24,2012. Thousands showed up as the gigantic work was unveiled on the museum’s rear lawn, where it is intended to remain forever. (AP Photo/Richard Vogel)

Michael Heizer's 'Levitated Mass'

The Los Angeles County Museum of Art pulls the covers off artist Michael Heizer's latest creation — a 340-ton boulder positioned to appear as though it's floating in midair -- called "Levitated Mass." (June 24/AP)