"I worked out a book which I thought was just straight science fiction -- with everything pretty much explained, and suddenly I got an idea which I thought was kind of neat for working in a mythological angle. I'm really struggling with myself. It would probably be a better book if I include it, but on the other hand I don't always like to keep reverting to it. I think what I'm going to do is vary my output, do some straight science fiction and some straight fantasy that doesn't involve mythology, and composites."

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Once I'd worked out that I couldn't possibly expect people to enjoy a monstrous, 3000-page book, I realised I could in fact create a labyrinth of a story with four different points of entry. But what interested me was creating something that would rearrange itself every time you read one of the other books. So depending on which order you read them, the implications and angles would change. To get that right, each one of the books had to have its own personality and texture -- even though they are connected, they are very different creatures.

— Carlos Ruiz Zafon