"What exactly is mathematics? Many have tried but nobody has really succeeded in defining mathematics; it is always something else."

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When people say "How do you write a book, how does it all happen?" I say, you line things up, and you line them up as actually as you possibly can, but sooner or later the book has got momentum and it's moving along under that momentum. It's like a sculpture, if you're working with the grain of the wood, the wood will start defining what shape it's going to become.

— Terry Pratchett