The first half of the 20th century saw radical change in sculpture. Artists shifted away from traditional concerns and produced work that questioned the object’s relationship with its material, its subject, time, and eternity. Alexander Calder used wood and wire to make kinetic explorations of space. Mirò created bronze sculptures that invoke elements of nature. Julio González turned iron into eloquent abstractions. In seven sections, the curator David Bestué addresses our different expectations of sculpture, presenting works from the 20th and 21st centuries. “In some cases,” he says, “there are elements, objects, that aren’t from the art world, but which serve to reinforce this idea of sculpture as an element-object that is found in reality.” —E.C.