Origami Corrugations: Star Spring

The Star Spring is a very ingenious model created by Shuzo Fujimoto.
Collapsing the model and closing the spring can be a little tricky, but it is worth trying as the result is amazing.

The instructions can be found in the book, Fujimoto World - Twist Fold, ISBN 9784416312001.
I folded it with a A4 size sheet of copy paper.