You might have seen a pleated structure incorporated to a model. It is commonly used in insect for the abdomen, animal's ribs, or array of "spikes" on top of animal like crocodile. I know how to construct it on boxpleated, but I wonder if the solution on non-boxpleating is generalizable. I remember that I've folded Kamiya's dragonfly and inoshishigami which uses that structure. On inoshishigami, the rib pleat starts from single flap. This flap is squashed, then slid to top; as if now there's a river separating the flap. That step is repeated until that flap is split into 4 smaller unit flap, separated by rivers. However, in the last pleat Kamiya prepared squash on each edge so the final flap sliding can be performed. On dragonfly, the process is similar but the flap sliding is more prominent. Based on those models, along with warm shower, I started understand how it works. Basically, we can split a 1-unit flap into N smaller flaps with length of 1/N unit, eac...