 Dürer's well-known engraving Melencolia I depicts a frustrated thinker sitting by a truncated triangular trapezohedron and a magic square. These two objects, and the engraving as a whole, have been the subject of more modern interpretation than the contents of almost any other print, including a two-volume book by Peter-Klaus Schuster, and an influential discussion in Erwin Panofsky's monograph of Dürer. Salvador Dali's Corpus Hypercubus depicts an unfolded three-dimensional net for a hypercube, a four-dimensional regular polyhedron.
