Since the late 1970s, American artist Stan Herd has been creating gigantic crop art — portraits and other images he creates by plowing, planting, and mowing on large tracts of farmland all around the globe, but especially in his homeland Kansas. Inspired by the pre-Columbian drawings on the desert floor of the Andes Mountains, Herd completed his first projected in 1981. It was a 160-acre portrait of the Kiowa chief Satanta, whose heroic exploits had made him a symbol among the Kiowa of resistance to European American encroachment. Herd began with a paper sketch of Satanta which he transferred to the land by means of numbered flags. He then used a tractor pulling a brace of disc rotors behind him to etch the final image into the soil.