The graphic designers behind the new Diagon Alley theme park reveal how they translate the stuff of film and books into real-world magic.Hundreds of wannabe-magicians walk down a cobblestone street, lugging bags filled with wands, robes, and plush three-headed dogs. A dragon breathes fire atop a giant bank, where animatronic goblins lead visitors--some probably crying after waiting on a four-hour line--to a massive thrill ride, in which they have to smuggle gold past evil wizards without throwing up all the butterbeer they just drank.Read Full Story