Orihon

Orihon (OR-ee-hon, 折本) is a book consisting of a long strip of paper that is written on one side and then compacted by folding in zig-zag fashion. The orihon format is considered a step between a scroll and a codex.

The style of folding is similar to that of the air bellow of a concertina or accordion, such that every written page faces another written page when the book is closed. It may therefore be opened to any page.

The word is borrowed from Japanese and combines the roots "ori" (fold) and "hon" (book). Orihon folding is typically associated with Japanese Buddhist works.