M. C. Escher/Talk

The math behind much of Escher's work has been explored in various documentaries and in at least one article in Scientific American, published sometime before '97. In this article it was mentioned that one of the constructions on a building in an Escher print exemplified some principle of quantum physics, years before that principle was discovered. Does anyone know anything further about this (when the article might have been published or, better yet, the story behind that construction and/or the principle of quantum physics and/or their significance?) Also this article could stand some discussion of perspective and math, but I am not knowledgeable enough to do it right and so will leave it alone. I hope someone else will be interested enough to add it. :-) --KQ