Yi Ha-ŭng (also known as Taewŏn’gun), Orchids and Rocks, 1896–1898, One of a set of four hanging scrolls; ink on silk; with one square, red, intaglio seal of the artist reading "Kŭng Chŏng Ŭng Sŏn Pul Ch'a Saeng Yu Cha Son", Harvard Art Museums, Cambridge. https://dartabase.art/cite/harvard/5649

František Kupka, An Absolute (Une Absolue) from Art of Today, Masters of Abstract Art (Art d'aujourd'hui, maîtres de l'art abstrait), Album I, 1953 (original executed in 1952), One from a portfolio of sixteen screenprint reproductions, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/31875