The sliding action on this modular design can transform a square-holed octagon, which resembles an ancient Chinese coin (cash), to a square, and vice versa.
The common 6-inch (15 cm) commercial kami is a bit flimsy for this design. Use 3-inch or smaller commercial kami to make a smaller model or use thicker 20-lb. (75 gsm) or heavier paper to make a larger model.
Editor’s Note: Heavier paper works well, even for a small model.