A Lemonade and an AK-47 to Share, Please

Marcel Broodthaer’s two-room, 1975 installation, Décor: A Conquest, up at the Michael Werner Gallery through mid-September, is making a very timely U.S. debut. Is it a conceptual, wartime take on American leisure — Michael Moore meets Marcel Duchamp? Or is it an imagined sidewalk café for National Rifle Association members? —Rachel Wolff