An 86,000-square-foot addition to Chazen Museum of Art at the University of Wisconsin-Madison will open this fall. Machado and Silvetti’s freestanding gallery building connects across a bridge to the 1970 Harry Weese–designed original and riffs on the midcentury limestone and copper cladding. “We don’t want to make two museums, we want to make one,” design lead Rodolfo Machado, Intl. Assoc. AIA, says.