Jannis Kounellis, Untitled (Hanging Knife), 1991, Metal, glass, etching on paper, hook and knife, Tate, London. https://dartabase.art/cite/tate/AR00582

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

Jannis Kounellis, Untitled (Coffee), 1989–91, Metal, glass, etching on paper, coffee beans and lead, Tate, London. https://dartabase.art/cite/tate/AR00581