Levitated Mass by artist Michael Heizer is composed of a 456-foot-long slot constructed on LACMA's campus, over which is placed a 340-ton granite megalith. The slot gradually descends to fifteen feet in depth, running underneath the boulder. As with other works by the artist, such as Double Negative (1969), the monumental negative form is key to the experience of the artwork.

Heizer conceived of the artwork in 1969; a drawing of the work is in the collection of the Staatliche Museen zu Berlin. The artist discovered an appropriate boulder only decades later, in Riverside County, California. The boulder is one component of the artwork, as is the 456-foot-long slot beneath it and the surrounding environment.

Taken whole, Levitated Mass speaks to the expanse of art history, from ancient traditions of creating artworks from megalithic stone, to modern forms of abstract geometries and cutting-edge feats of engineering.