The GMB is a dramatically scaled limestone-and-titanium-clad conglomeration of vertical and horizontal volumes. United off-center by an enormous glass-walked atrium and topped by a cluster of organic froms suggesting a "metallic flower," as Gehry calls it. At 256,000 square feet,it is the Pritzker Prize winner 's largest museum to date(his best known is the Frederick R. Weisman Art Museum in Minneapolis).