In 1968, artist Michael Heizer began a multi-decade long journey to move and transform a two-story, 340-ton granite boulder from Riverside, California into an installation at the Los Angeles Country Museum of Art. The film asks the question, “What is art?” Encompassing this monolithic display of ancient-feeling modern art is the story of Heizer’s past and present work, the ambitions of a major metropolitan museum, and the public’s wild reactions to this gargantuan effort.