Black Books

Apocrypha
The most prominent feature of Apocrypha, is the vast number of books that make up Hermaeus Mora's collection. Giant stacks of books break the surface of the poisonous sea, numerous shelves that line the halls and walls are crammed to bursting with ancient scrolls and moldering journals, heaps of books and papers litter the floors, and even entire buildings are constructed from twisting stacks of books. These books are protected and maintained by the Seekers and Lurkers, who make up the majority of the inhabitants of Apocrypha. (information from Skyrim Wiki)