Once upon a time, before instant Kindle books, before Amazon, before Barnes & Noble, before the printing press, books were made by hand. From scratch. They made the paper (and before that, they made papyrus and parchment) and wrote each word. At some point, pages were bound together with leather covers, but there were many collections of pages wrapped in covers, like you see here. The books might be stored in wooden chests, or on ceramic shelves.