The Bookcase holds up to 16 books and shows visually where the books sits in the inventory. Also works with enchantment tables. The books are counted and 8 books count as 1 vanila bookshelf. So a full bookcase counts as 2 vanilla bookshelves. The bookcase also comes in the 6 different vanilla woods and in a framed block version which can be used with the Furniture Paneler to make it look like any solid block..