For Italy, and for Europe generally, sixty-nine-year-old Enrico Castellani’s life, perhaps even more than his art, provides an exceptional example of coherence. Inspired by Lucio Fontana, he was a fellow-traveler of Piero Manzoni, with whom he established the Azimuth gallery and magazine in Milan in 1959. Castellani has spent forty years working on a single problem: the surface in relation to light. His protruding canvases feature small nails mounted on a complex frame on which he constructs monochrome “surfaces,” where light (in the form of its opposite, shadow) takes hold, moves, changes