Orlion commented on The Name of the Rose by Umberto Eco (Harvest in translation)
It is the year 1327. Franciscans in an Italian abbey are suspected of heresy, but …
You see, the library is a labyrinth because all libraries are labyrinths! Gasp!
In modern times it's called "L-Space" (short for "library space").
"...Large quantities of magical and mundane books create portals into L-space that can be accessed using innate powers of librarianship that are taught by the Librarians of Time and Space to those deemed worthy across the multiverse..."