Oooh, Loki gets to explain something! He only barely restrains a happy little dance, settling for a wide grin instead and transferring his magpie to his shoulder so his hands will be free for wild gestures.

"Okay, well, you know knowledge is power, right? Well, power is energy, and energy is mass, and when you put enough mass together, it bends space. That's gravity, right? And every big chunk of gravity is pulling on every other big chunk of gravity, because that's how it works. Well, books are piles and piles of knowledge in a small space, and when you group them all together in a library, they kind of multiply each others' effect. And when some of that knowledge is magic knowledge, stuff that's meant to distort not just space but reality, then it really gets exciting!"

He grins. "Basically, whenever you get a big enough collection of smart enough books together, it bends space into funny shapes, to the point where it kind of goes under the rest of time and space and gets in touch with all the other big piles of books down there. So when you find a library you can get lost in, you can get really lost. And that place where all the libraries touch, that's outside normal space? Well, we're outside normal space, too, aren't we?"

You see what he's getting at?