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Robert Smithson's monumental earthwork Spiral Jetty (1970) is located on the Great Salt Lake in Utah. Using black basalt rocks and earth from the site, the artist created a coil 1,500 feet long and 15 feet wide that stretches out counter-clockwise into the translucent red water. Spiral Jetty was acquired by Dia Art Foundation as a gift from the Estate of the artist in 1999.