Accordion books are a way to bind books without the hassle of sewing. It’s a long stretch of paper folded into page sized increments.
This technique was used by buddhist priests in feudal japan. One famous example is the Orihon, a style of accordion books in Japan.
It was a step between a codex and a scroll. It’s primary use was for religious teachings. Normally only one side of the book is written upon but in modern times, artists may use the other side if the want to.
Orihon.” Wikipedia. Wikimedia Foundation, n.d. Web. 11 Sept. 2016. Famous example.
Bonney, Grace. “Bookbinding 101: Accordion Book.” Bookbinding 101. Design Sponge.com, 2013. Web. 11 Sept. 2016. I used this to find out what bookbinding is, how it’s done and why people do it.