In "Earthworks in Motion," photographer Paul Johnson adds another layer to the land art movement by using a painstaking stop-motion animation process to document his ephemeral creations.

The film, which is part of his larger "Landthropologic" series, is the culmination of several "earthworks" that Johnson created and documented over the course of 2015 in the Minneapolis/St. Paul metro area where he lives. Each clip represents between one and two hours of elapsed time.

Johnson explained to ThisIsColossal that he "has long been fascinated with creating art in the dirt, so to speak, every since drawing in sand with a stick at the beach for hours on end as a child." Of course, this whimsical use of the Earth's natural elements to create art obviously extended far beyond Johnson's childhood. After learning about the work of well-known land artists like Andy Goldsworthy, Robert Smithson and Jim Denevan in his college years, Johnson began experimenting with his own earthworks, and the rest is history.

Continue below to see more of Johnson's sublime work. Be sure to follow all of his ephemeral art-making adventures on Tumblr and Instagram.

Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.