The "Penrose stairs" (with a woman perpetually picking up papers) that Arthur shows Ariadne is a reference to a lithograph print by the Dutch graphic artist M.C. Escher. The print is usually called "Ascending and Descending" or "The Infinite Staircase", and was first printed in March 1960; Escher is well-known for his drawings exploring optical illusions and real architectural, mathematical, and philosophical principles rendered in fantastical ways.

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