The Andy Warhol Museum is holding a special retrospective of the connections between Warhol and Duchamp; as the museum promises, "many Duchamp works" are on loan from the Moderna Musee in Stockholm, and new archival material should generate new insights into how Warhol viewed Duchamp and how their works — now enshrined on opposite ends of Pennsylvania — inform each other.

(Through September 5;  www.warhol.org.)