Yesterday I taught a workshop at the Morgan Paper Conservatory in Cleveland. The participants who made these amazing books incorporated a concertina fold that creates both the spine and the attachment for the pages. The book is called a piano hinge structure due to the way the covers lock together with a dowel as seen in the sample below.
It was a gray January day in Ohio but having this project to work on was fun and I hope rewarding for all. The Morgan is a great place to learn new techniques involving paper making, printing and the book arts. You can visit their website at http://morganconservatory.org.