Double Negative was among the first "earthworks" -- artworks that use as their canvas or medium the earth itself. In keeping with the mission of modern art, Double Negative blurs the distinction between sculpture ("art") and normal objects such as rocks ("not art"), and encourage viewers to consider how the earth relates to art. The sheer size of Double Negative also invites contemplation of the scale of art, and the relation of the viewer the earth and to art itself. How does art change when it can't fit in a museum? How does one observe an artwork that's a quarter-mile long?