The wall of reeking bologna at the entrance sets the tone for guest curator Kara Walker’s exhibition “Ruffneck Constructivists,” on view through August 17: Simply confrontational at first glance, the show hugely rewards a long, thoughtful look. In her text for the exhibition Walker describes its eleven artists as “defiant shapers of environments . . . [who] build themselves into the world one assault at a time.” The title’s clashing references to “Ruffneck”—female rapper MC Lyte’s 1993 ode to the streetwise “dude with attitude”—and the revolutionary Russian avant-garde likewise suggest