Joan Mitchell at Folkwang Museum
An ancient French vineyard is reborn as a site for permanent art installations and modern architecture
Albertina, Vienna Through January 9
Cheerful conceptual prankster Erwin Wurm creates a surreal universe where Bosch meets Looney Tunes.
Groucho Marx meets Dr. Frankenstein in the hilarious multimedia extravaganzas of John Bock, whose improbable props include mayonnaise, cigarette butts, and artificial blood.