Smithson, Robert (1938-1973), a prominent U.S. artist, original critic, and theorist, is known for the Spiral Jetty (1970) in Utah's Great Salt Lake and other earthworks. He was a continuing influence and significant voice with respect to environmental art and postmodernism, introduced concepts such as entropy and geological time into the making and discussion of art, and focused on the intertwining of text and visual structure or surface.

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