Jean Pougny (Ivan Puni), Study for Relief Sculpture, 1916, Watercolor and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38314

Jean Pougny (Ivan Puni), Flight of Forms, 1919, Gouache and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33452