Block

The block is the large mass of pages that form the center of the codex. These are considered distinct from the endpapers and the cover, and typically contain the bulk of the book's contents. Most books are made from a collection of peciae, or 8/16/32-page bundles of paper that are put together to form the book itself. This is why some of the pages near the back of some books are blank, because they need to reach the quota.