"Every great magic trick consists of three parts or acts. The first part is called "The Pledge". The magician shows you something ordinary: a deck of cards, a bird or a man. He shows you this object. Perhaps he asks you to inspect it to see if it is indeed real, unaltered, normal. But of course... it probably isn't. The second act is called "The Turn". The magician takes the ordinary something and makes it do something extraordinary. Now you're looking for the secret... but you won't find it, because of course you're not really looking. You don't really want to know. You want to be fooled. But you wouldn't clap yet. Because making something disappear isn't enough; you have to bring it back. That's why every magic trick has a third act, the hardest part, the part we call "The Prestige"."
— Christopher Priest (The Prestige Movie Tie In)

"'Beyond the city...' That meant I would leave the city, venture as an apprentice into the very regions which had been forbidden me, and were even yet forbidden to most of those in the city. The creche was full of rumours about what lay outside the city, and already I had any number of wild imaginings about it. I was sensible enough to realize that the reality could never equal those rumours for inventiveness, but even so the prospect was one that dazzled and appalled me. The cloak of secrecy that the guildsmen placed around it seemed to imply that something dreadful was beyond the walls of the city; so dreadful that a penalty of death was the price paid for revealing its nature."
— Christopher Priest (Inverted World)