Tom
Tom asked Genevieve Cogman:

Do the librarians have any theories on why the library and parallel universes exist?

Genevieve Cogman They have lots of theories, but nothing definite in the way of proof. Theories on the alternate worlds range from "they split apart at the point when someone makes a really important choice" to "it's something to do with the dragons" or "it's something to do with the Fae". Very few people agree with the "it all depends on whether or not Agatha Christie existed" school of thought.

Nobody's quite sure how the Library was created, or founded, or came into existence - and if some of the older Librarians do know, they're not telling.

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