Richard Tuttle, Study for First Green Octagon, (1967), Watercolor and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34243

Richard Tuttle, Two or More, VI, 1984, Plastic, newpaper, wire, corrugated brown paper ink and acrylic, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34248