Earthworks.

Maybe that is what the earthworks of the ancient Native Americans have in common with the earthworks of contemporary art. The Mound Builders were, in their way, the original American architects. But unlike modern architecture, earthworks have what might be called an intentional disappearance. When archaeologists looked inside the mounds a hundred and seventy years ago, they saw the remnants of wooden structures. Only, the structures were covered over with earth, destined to collapse, and be swallowed by the land. 

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