Abstract painter, founder in 1950 in Milan of the Gruppo Origine (with Alberto Burri, Giuseppe Capogrossi and Ettore Colla). Inventor of Chromatology, an interdisciplinary method for solving «visual problems of collective interest»: from the colour of ambulances to that of school notebooks. His goal was to defeat the monotony «that makes us born with white, live with grey and die with black», convinced that colour also modifies the shape of things: at the beginning of the Seventies he introduced chromatology as a subject of study at the Brera Academy.