WAfrica and South America tessellationWA Bird in FlightWBoat (drawing)WCircle Limit IIIWContinuum (sculpture)WCrucifixion (Corpus Hypercubus)WFractal AfricaWGarden of Cosmic SpeculationWOctacube (sculpture)WRelativity (M. C. Escher)WReptiles (M. C. Escher)WThe Swallow's TailWWaterfall (M. C. Escher)