František Kupka, Girl with a Ball, c. 1908, Pastel on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37352

Anonymous Artist, Judith with the Head of Holofernes, c. 1480, pen and dark brown ink with black chalk and white heightening on olive-brown prepared paper laid down on canvas, National Gallery of Art, Washington. https://dartabase.art/cite/nga/319

Stanislav Kolibal, [Untitled], (1975), Ballpoint pen and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34553

Stanislav Kolibal, [Untitled], (1975), Ballpoint pen and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34568

Alphonse Mucha, Rocks on the Shore, n.d., Charcoal on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36941

Anonymous Artist, Christ before Pilate, 1606, brush and brown ink on brown paper, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1841

František Kupka, Bather, (1906), Pastel and charcoal on gray paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37271

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

Joaquín Torres-García, Composition, 1932, Ink and pencil on brown paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38816

Alphonse Mucha, Head of a Child, (n.d.), Pencil on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36948

Anonymous Artist, An Oriental, 1606, pen and brown ink with brush and brown-black ink on laid paper, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1851