The UU Library is theoretically the largest in the universe or, indeed, any conceivable universe; it has a diameter of about one hundred yards but, as far as we can determine, an infinite radius. The presence of so much stored magic does to time and space what a hot iron does to a pound of butter, so that you may well encounter places where the floor is now the wall, the books have turned into small clay models of hedgehogs and you yourself appear to be a device for coring apples. Students will therefore find it convenient to stick to the routes marked with chalk and the occasional banana skin.
We must warn you that many students have cleverly worked out that since the Library does, somewhere, contain any book that will ever or could ever be written, their own doctoral thesis must be in there on some distant shelf. This is true. Setting out to find it is, however, an extremely unwise move. We can assure you that, however long it takes, staying here and writing the damn thing is a lot easier in the end.
”- Terry Pratchett & Stephen Briggs, The Ankh-Morpork Archives.