In the mid-1920s he developed an abstract style, lyrical and often witty, with amoeba shapes, some linear, some highly coloured, generally floating on a plain background. During the 1930s his style became more sober and after World War II he produced larger abstracts. He experimented with sculpture and printmaking and produced ceramic murals (including two in the UNESCO building, Paris, 1958). He also designed stained glass and sets for the ballet impresario Sergei Diaghilev.
