Jacques Lipchitz, Girl with Braided Hair, (1914), Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36065

Jacques Lipchitz, Seated Nude, (1915), Crayon, charcoal, pencil, watercolor, and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34448

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

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