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

František Kupka, Study in Verticals (The Cathedral), (1912), Pastel on colored paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34122

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

František Kupka, Study with Green, (c. 1912), Chalk and gouache on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38151