I ran into this interesting little tidbit of info on about.com: "Anton LaVey, in his popular work, The Devil's Notebook, credited some of Chicago's paranormal openness to its architecture, namely, the trapezoidal John Hancock building, the shape of which has been traditionally known as a gateway for arcane forces." This according to the book Creepy Chicago; A Ghosthunter's Tales of the City's Scariest Sites by Ursula Bielski. In my best Johnny Carson voice, I can honestly say "I did not know that."