"A lot of dangerous books too," Intel said somberly, "And one mare, dragon and owl cannot simply control a whole library of mischievous books. It's...being worked on. Books have magical energy of their own you see, and when you pack a large amount together, strange things start to happen. It's what L-space is going to be running on. Knowledge=power=energy. It took a mad pony to even design a library that can hold as much as the one in Canterlot does. A genius pony, but a mad one. Have you been in there, Star?"
"And as for Sparkle, she has to learn how to lead the Elements of Harmony I suppose, and that means knowing how to work with the others. It makes sense for her to live near the others."