Art on a grand scale, The Topographic Projections and Implied Geometries Series by Jim Sanborn.
These images were produced by direct, large format, light projection. The projector, powered by a mobile generator, was moved from site to site. All of the pieces were photographed at night using long exposures. On moonless nights, the landscape was lit with searchlights. The landforms themselves are quite large, requiring the projector and camera to be, on average, 1/2 mile away from the subject landscape.