I'm amazed by the paper crafts designed by Haruki Nakamura. Here's a video: https://www.youtube.com/watch?v=LQwih8r5xf4
I'm particularly interested in his bomb animals. I don't really understand how they work but I'm guessing it has to do with the tension of the material. Has something like that been done in origami? I'd love to see that! Thanks in advance : )