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The Levitated Mass art installation may bring back horrible flashbacks for American outdoorsman Aron Ralston, who happens to be the inspiration behind the film '127 Hours.' A behemoth boulder has been precariously placed on top of a walkway, creating a scene worthy of both wonder and anxiety. It seems like it would be only a matter of time before it fell down, perhaps pinning someone to the wall like Ralston was nearly a decade ago.

Commissioned by the Los Angeles County Museum of Art, the Levitated Mass installation was created by artist Michael Heizer. In addition to the stone, Heizer also replaced the green lawn with dry, sun-blasted expanse of decomposed granite to create the illusion of a barren desert cutting through an urban landscape.