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Nina Katchadourian: Curiouser: It’s OK to laugh in an art museum. Katchadourian is an artist who brings humor to her examination of such weighty topics as identity, authenticity and human communication. Closes Jan. 7. Cantor Arts Center, Stanford University, 328 Lomita Drive at Museum Way, Stanford. http://museum.stanford.edu

Gods in Color: Polychromy in the Ancient World: We have long known that classical sculpture was originally painted, not pure white marble, but it is a shocking educational experience to see recreations of the polychrome originals. Closes Jan. 7. Legion of Honor. http://legionofhonor.famsf.org

Isaac Julien: Playtime: Three cinematic installations by the British artist, including an ultra-high-definition, seven-screen environment, that weaves together sublime landscapes and brawny city views. Sumptuous and transfixing. Free. Through Feb. 11. Fort Mason Center for Arts and Culture, 2 Marina Blvd., S.F. (415) 345-7575. http://www.fortmason.org.

Sanctuary: Prayer rugs, handwoven in Pakistan to the specifications of 36 contemporary artists from 21 countries around the world, furnish a fine site for contemplation at this time of year. Free. Through March 11. Fort Mason Chapel, Franklin and Bay streets, S.F. http://www.for-site.org

Robert Rauschehberg: Erasing the Rules: An expansive exhibition that makes clear why the artist was one of the most influential of the latter half of the 20th century. Through March 25. San Francisco Museum of Modern Art, 151 Third St., S.F. http://www.sfmoma.org