"So what are the rooms with the patterns for?" Colle continues, avoiding the Eldarin word which the stranger had used. "The nexus rooms," Inric says, giving her the Eynvardi term. "I know there's one on Saldissay, but you don't need to use them, do you?" She thinks she might be asking about private matters, but Inric answers as though it's a normal question. "Using the world-bridges requires one, and for places like the library, it is better to manage entry and exit in one location." "Do they allow you to go somewhere new?" she guesses. "That is part of their function, yes." "So you started at the nexus, but the book is a long way away from it?" "Yes." "How did it get so far away?" "Travelling books are a complex phenomenon." But she knows what that means. "Ah, so nobody knows?"