In 1935, Marcel Duchamp sat in a booth at a Parisian inventors' fair, futilely hawking paper discs that, when placed on a phonograph, gave a startling 3-D effect. Olafur Eliasson does Duchamp better many times over with his interactive kinetic sculpture, The uncertain museum, which returns to the floor of Duke University's Nasher Museum for the remainder of the summer. Stepping within a cylindrical screen, you'll see your silhouette instantly multiplied and reflected by three rotating, mirrored discs. Your shadow selves emerge, dash about and senesce. Simultaneously disorienting and exhilarating, The uncertain museum provides a mini-laboratory for considerations of optics and identity. It's also a gigantic toy. The show is free on Thursdays from 5–9 p.m. —Chris Vitiello