Who created "Untitled (Man and Woman in a Spatial Illusion)"?

Untitled (Man and Woman in a Spatial Illusion) was created by Saul Steinberg in 1968.

What medium is "Untitled (Man and Woman in a Spatial Illusion)"?

Untitled (Man and Woman in a Spatial Illusion) is graphite, pen and black ink, charcoal, colored pencil, and crayon on MBM Ingres d'Arches paper.

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Saul Steinberg, 1968