I love an origami section which presented Mr. Kasahara -- origami puzzles. I have one puzzle for you. I do not know, if Mr. Kasahara know it and if not, this one is for him, Yokko-san:
If you do not understand, what is that puzzle, classic Yokko-san is from one colour and Mr. Kasahara presented several color-changed variants, but not about body, as far as I know. Solution is relatively simple, so you can try it, if you want.