No, it's trompe l'oeil and it's at that oddly fascinating site Mighty Optical Illusions which brought you 3D sidewalk art and Cardiff Bay Baragge Illusion by Felice Verini (yup that's a double g, though not, of course the official spelling) . But I think the most impressive trompe l'oeil on the site so far is John Pugh's Taylor Hall, at the California State University, Chico. Pugh, an alumnus of Chico, writes 'My intention was to use the Doric column, a symbol that is easily recognized in our culture, to represent the classic architecture of the Greeks, and also to tap into the idea of the Greek academe as the essence of our western educational system' Hmmm. There you are then. There's more fascinating trompe l'oeil here and here.