The unicorns were the most recognizable magic the fairies possessed, and they sent them to those worlds where belief in the magic was in danger of falling altogether. After all there has to be some belief in magic- however small- for any world to survive.

I would also argue that there is a good chance that an outline will help you stave off any onslaught of writer's block. Let me advise you right up front that I am not a big believer in writer's block. I think writer's block is God's way of telling you one of two things - that you failed to think your material through sufficiently before you started writing, or that you need a day or two off with your family and friends.

For a writer, its very attractive to stay in one world for a time.

On the other hand, I still approach each book with the same basic plan in mind - to put some people under severe stress and see how they hold up.

...[Y]ou have an inner strength that makes it possible for you to do things other people couldn't even begin to think of doing.

Lester del Rey told me repeatedly that the first and most important part of writing fiction is just to think about the story. Don't write anything down. Don't try to pull anything together right away. Just dream for a while and see what happens. There isn't any timetable involved, no measuring stick for how long it ought to take. For each book, it is different. But that period of thinking, of reflection, is crucial to how successful your story will turn out to be.

The unicorns were the most recognizable magic the fairies possessed, and they sent them to those worlds where belief in the magic was in danger of falling altogether. After all there has to be some belief in magic- however small- for any world to survive.