But imagination is a vague word and I must make some distinctions. It may mean the world of reverie, daydream, wish-fulfilling fantasy. Of that I knew more than enough. I often pictured myself cutting a fine figure. But I must insist that this was a totally different activity from the invention of Animal-Land. Animal-Land was not (in that sense) a fantasy at all. I was not one of the characters it contained. I was it creator, not a candidate for admission to it. Invention is essentially different from reverie; if some fail to recognise the difference that is because they have not themselves experienced both. Anyone who has will understand me. I my daydreams I was training myself to be a fool; in mapping and chronicling Animal-Land I was training myself to be a novelist.
- C.S. Lewis, Surprised by Joy