In 1918, as W.W. I was ending, the French poet Guillaume Apollinaire, an impassioned defender of Cubism, died of influenza. In 1928, Picasso was asked to propose plans for a monument to Apollinaire; his objective was to create something as radical as the man he was honoring. Picasso started with a set of drawings made with black marker. He then took these to his friend, the experienced metalworker Julio González. The idea was to “draw in space” with iron, and the collaboration would breed a new species of sculpture—less precious than marble or bronze, less solid. This exhibition focuses on the origins of metal sculpture, and on the affinities between Picasso and González. —E.C.