I’m standing in a fallow field on the edge of the San Luis Valley, in south-central Colorado. To the east, beyond a windbreak of tough old trees, the Great Sand Dunes rise against the mountains, where for millenniums this same wind has piled up this same sandy soil. Its creator, the French artist Marguerite Humeau, 36, thinks a lot about extinction. They clack and whistle in the stronger gusts. But the land itself is the work.

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Persons: Marguerite Humeau, “, ” Locations: San Luis Valley, Colorado, Denver, French