The treasure of fairy tales is their call to adventure for everyone who hears or reads them, a call to an adventure of the imagination. The story of the Ugly Duckling, for instance, speaks to everyone who has ever felt lonely or unloved. The story of the Billy-Goats Gruff speaks to everyone who has felt small or weak. In a fairy story, there is always help, and extra inspiration, a helpful friend, a dream that hints at an answer, a fairy godmother,...