- "The book, often considered synonymous with the codex, can be understood variously as an object, a form of content, an idea, or an interface." (Borsuk, 2018). Commonly understood as a medium " (Wikipedia, 2021), physical books are typically objects composed of pages, usually containing print or writing, that are stitched or glued together along one side and bound between two covers. The content and interfaces of mainstream e-books are overdetermined by both the materiality and idea of the book.