This binding structure is ideal for books with imagery that fills a full spread, i.e. both sides of the folio. The structure allows the book to open fully and pages to lay flat. In addition, there are no threads that run through the spine that might interfere with imagery. Many children’s books use the same structure, albeit wth much thicker pages, hence the term “board book.” It is especially with these thicker pages that the structure shows its benefits as it allows stiff pages to lay flat. There are also strong structural similarities with the “drum-leaf” binding developed by Timothy Ely and described in The Bonefolder, Volume 1, No. 1, Fall 2004.