Fishbone Fold & Diagonal Pocket Fold Envelope
This book structure was designed by Hedi Kyle (German born, taught at University of the Arts, Philadelphia) It can be altered in many ways, with more sections, or taller or longer panels. Karen Hardy is an artist who created a gorgeous book titled Drift by binding multiple fishbone folded structures together. Tia Biakaiddy (ASU alum) created a wonderful zine about homelessness using this structure (see in slideshow below).
Diagram of Fishbone Fold
Step-by-Step Photos of Fishbone Fold
Step-by-Step Photos of Diagonal Pocket Fold Envelope
Fishbone Fold Guidelines
Diagonal Pocket Fold Envelope Guidelines