František Kupka, Composition géométrique (Geometric composition), c.1909–11, Gouache on paper, Queensland Art Gallery and Gallery of Modern Art, Brisbane. https://dartabase.art/cite/qagoma/65734

Roberto Estopinán, Prisoner, 1967, Colored ink and ink on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33104

Roberto Estopinán, [Untitled], 1967, Transfer and ink on pink paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33123