Roél d'Haese, [Untitled], 1959, Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33976

Pierre Alechinsky, Study for The Snowman ([Étude] L'Homme des neiges), 1956, Ink and watercolor on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35910

Octave Landuyt, Turtle, 1957, Ink, crayon, and gouache on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37770

Roél d'Haese, [Untitled], 1959, Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33963

Aleksander Kobzdej, Conflict, 1959, Casein and oil on paper on canvas, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33730