Levitated Mass chronicles the journey of a 340-ton granite boulder that was moved from a quarry in Riverside to the Los Angeles County Museum of Art and mounted upon the walls of a 456-foot-long concrete slot. First attempted in 1968, the 2012 permanent installation “Levitated Mass” is the latest land sculpture by one of America’s most misunderstood and exciting artists, Michael Heizer. His rock’s 105-mile transport captured international media attention and challenged the imagination of thousands of southern Californians over 10 nights as it crawled through four counties on a football-field-long transport. As fascinating is the dramatic story of Heizer’s past and present work, the ambitions of a major metropolitan museum, and the public’s reaction to this massive display of modern (yet ancient-feeling) conceptual art.