Artist, born in Rosario, Argentina. He was brought up in Milan, studied at the Accademia di Brera (1928--30), and in 1935 signed the First Manifesto of Italian Abstract Artists. He made his name as the inventor of Spazialismo (Spatialism) and as a pioneer of "environmental art'. He is best known for his bare or monochrome canvases, holed or slashed to create what he called attese. These in turn looked forward to the "gesture' or "performance' art of the 1960s.