Deletion of Robert Willson (artist)

Comment: In the collections of http://americanart.si.edu/collections/search/artwork/?id=68053 the Smithsonian, the http://www.philamuseum.org/press/releases/2007/631.html Philadelphia Museum of Art, and http://collectionsonline.lacma.org/mwebcgi/mweb.exe?request=record&id=133889&type=101 LACMA. Showed at the Venice Biennale in 1972. Clear pass of 
Stance: keep
Cited policy: Wikipedia:Notability (WP:CREATIVE)