By Marian Goodman Gallery
By Smarthistory
By The Utah Museum of Fine Arts - The University of Utah
By Phaidon
By 123RF
![Mirrors and Shelly Sand [Robert Smithson] | Sartle - Rogue Art History ロバート スミッソン](https://i3.wp.com/www.sartle.com/media/artwork/mirrors-and-shelly-sand-robert-smithson.jpg?ssl=1)
By Sartle
By 123RF
By HubPages
By Broken Circle/Spiral Hill
By SFMOMA
By Marian Goodman Gallery
By Arts Observer
By Wikipedia
By Projects - Columbia University
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By オークフリー
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