Shadow & Claw (The Book of the New Sun, #1-2)

by Gene Wolfe

To retain puzzle pieces that don’t connect, dropped without context, is a skill that not all have. All had it once: it is how children read, every book, poster, and headline a stream of unknown terms, far too many to ask about them all, but the child retains them, trusting that they will connect to something someday. Kids collect Earth’s puzzle pieces every time they read, but as we move to grown-up books they all use the same picture, and define immediately those terms they fear a reader may not know. Thus the skill of keeping puzzle pieces fades, unless we read books set in other worlds, new puzzle pictures which make us retain the skill, as frogs sometimes retain their tadpole tails into adulthood. This—many have observed—is why most F&SF readers come to the genre young, it’s hard to start in adulthood when one’s puzzle-memory skill has sat atrophied.