This octahedron was simple to make with six water bomb bases. The pieces slid together in about 20 minutes.
I also made this origami gyroscope. I think it turned out too big. I used a 4x4 square. Next time, I will be more mindful of the size. Another gripe about this book...they should suggest paper size. I do like the square cut out in the middle thoug...a window to the other side.