'I had sent my heroine straight down a rabbit-hole . . . without the least idea what was to happen afterwards,' wrote Charles Dodgson, describing how Alice was conjured up one 'golden afternoon' in 1862 to entertain his child-friend Alice Liddell. His dream worlds of nonsensical Wonderland and the back-to-front Looking-Glass kingdom depict order turned upside-down: a baby turns into a pig, time is...