Robert Delaunay, Football. L'Equipe de Cardiff, (1916), Oil on paper on wood, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38194

Robert Delaunay, The Tower, 1911, dated 1910, Ink and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35446

Robert Delaunay, The Tower and the Wheel, c. 1912–13, Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35439