Art in the desert went viral last fall with the debut of a bewitching spear of reflective metal in southern Utah. When Desert X returned two years later, artworks that contrasted starkly with their environs proliferated again. The Painted Desert Project, an ongoing street art exhibition on the Navajo Nation, has a similar effect. (Desert X itself has expanded more controversially, bringing the biennial to Saudi Arabia last year; the show drew international condemnation, given the Saudi government’s human rights abuses.) Top photo: An installment of the The Painted Desert Project in Bitter Springs, Arizona, created by Jetsonorama in 2009.