"Jake went in, aware that he had, for the first time in three weeks, opened a door without hoping madly to find another world on the other side. A bell jingled overhead. The mild, spicy smell of old books hit him, and the smell was somehow like coming home."

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If a coin comes down heads, that means that the possibility of its coming down tails has collapsed. Until that moment the two possibilities were equal. But on another world, it does come down tails. And when that happens, the two worlds split apart.

— Philip Pullman