Guggenheim ‘decommissions’ conceptual and Minimalist works over questions of authenticity

For nine years, the Solomon R. Guggenheim Museum has been foraging for answers to some of the most confounding questions raised by Minimalist and conceptual art from the 1960s and 70s: What makes a work genuine? If an artist decides he prefers an earlier or later iteration of his original work, which one should have pride of place in a museum? If an artist disowns a work altogether, how should the museum label and classify it?

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