"I love getting out of a gallery," says Sterling Ruby. His piece for Desert X, "Specter," is a ghostly rectangular shape that looks like an optical illusion. The bright orange color contrasts with the dusty chaparral and the white peaks of the San Jacinto Mountains, and as Ruby tells us, it's a color he associates with hunting season from his rural Pennsylvania upbringing. It also suggests prison uniforms and construction road hazards, a warning color that visitors have flocked to since it was installed.