Jean Hélion, Untitled, No. 19, 1933–34, Gouache on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38220

Jean Hélion, Ile de France, 1935, Watercolor and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38221