Makedo Windball is a simple, yet unique geometry project. Basically, all you do is assemble simple cardboards and turn them into a kind of art form. The main idea behind the project is actually quite abstract; it shows that there is no truly perfect sphere in this world. In addition, you can prove that spheres are made out of squares, hexagons, or triangles.
If you are looking for something to do with your kids, build a giant Windball with your kids to kick around the park, or create a smaller version to decorate your home. All you need are some cardboard sheets and Makedo re-pins and re-clips.