Reality is that which, when you stop believing in it, doesn’t go away. — Philip K. Dick When Dan Brown, the author of the mega blockbuster The Da Vinci Code, was asked, “Where did you get the idea for this book?” he explained that it came to him when he was studying art history at the University of Seville in Spain. There he was exposed to some of the mysteries of the da Vinci paintings. Years later, while he was studying the Vatican Secret Archives, the notion returned to him. He recounts, “This particular story kept Knocking on my door