Thomas Wilfred, Sequential Development of Three Form Groups, (1948), Colored pencil, ink, and colored ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37114

Thomas Wilfred, Study for Lumia Suite, Opus #158, 1964, Pencil on blueprint, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37111