"London always reminds me of a brain. It is similarly convoluted and circuitous. A lot of cities, especially American ones like New York and Chicago, are laid out in straight lines. Like the circuits on computer chips, there are a lot of right angles in cities like this. But London is a glorious mess. It evolved from a score or so of distinct villages, that merged and meshed as their boundaries enlarged. As a result, London is a labyrinth, full of turnings and twistings just like a brain."

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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