Karl Benjamin, *Black Pillars,* 1957.From retail furnishings to international auction houses, recent years have seen a resurgence of interest in midcentury modernism, an influential design aesthetic that flourished between the mid-1930s and the mid-1960s. During the 2008-09 academic year the Mildred Lane Kemper Art Museum at Washington University in St. Louis will host two major exhibitions exploring both the breadth and the cultural impact of midcentury modernism, through such mediums as…