One of the most charming and fascinating books for kids during the 1980s was Masquerade, by Kit Williams. At first glance, it was just another children’s picture book. On a deeper level, however, it was a map to a jewel-encrusted treasure buried somewhere in England. All you had to do was study the gorgeous illustrations for clues that would lead you to the spot where the author—a consummate illustrator, sculptor, clockmaker, and wizard—had hidden a golden amulet in the shape of the book’s protagonist, Jack Hare.