Driving through the Great Basin desert, in Utah and Nevada, we visited 3 Earthworks. All three were sponsored by Virginia Dwan, the visionary gallerist and heiress of the 3M company - Minnesota, Mining & Manufacturing. It was at Dwan Gallery, in 1968, that the show Earth Works defined what would become sculpture in the 'expanded field'.
The temperature was over 45°C when we visited Michael Heizer's Double Negative. We arrived at noon, and addressed the visit as a scientific expedition. We went back and forth, like astronauts or divers. Heizer's artistic compulsions can be traced to many artifacts that we saw throughout our journey, as if he is tapping the American id: the tire marks at Bonneville Salt Flats, the monumentalization of extractive industries, the exhibition of human power over nature.