In a way, that's not surprising. Duchamp (1887-1968), widely regarded as the founder of modern art, loved to foil his viewers' expectations. A work formally titled "The Bride Stripped Bare By Her Bachelors, Even," is actually what its nickname, the Large Glass, implies: a huge pane of glass. Rather, it's two panes, with designs painted on each. The top half, which Duchamp designated the bride, is dominated by a triptych of rough squares inside a dark cloud and a cascade of junk meticulously copied from one of Duchamp's earlier paintings. The bottom, "bachelor" half shows perspective drawings of several mechanical devices, including a chocolate grinder surmounted by an arc of conical sieves. CONTINUED>>