In celebration of its 50th-anniversary, the Smithsonian’s Hirshhorn Museum and Sculpture Garden has installed a major survey of artwork made during a transformative period characterized by new currents in science and philosophy, ever-increasing mechanization, and dramatic social change. “Revolutions: Art from the Hirshhorn Collection, 1860–1960” captures shifting cultural landscapes. Marina Isgro, associate curator, offers insights into the exhibition, which comprises rotating artworks in the museum’s permanent collection by 117 artists made during 100 turbulent and energetic years. (World Art History Certificate elective, 1/2 credit)