I found it very interesting how in each world we had the quest to find and read a book in every area displaying part of the history of the world. I think it would be a great idea if you could read these books at anytime, instead of just having them available during the quest.
That would make a cool housing item. A big book on a pedestal that you could walk up to and read the text again from any of the books you collected from your journeys through the spiral.