We're reviewing geometry with polygons and 3D shapes and we thought we'd have a little fun and challenge the kiddos with making octahedrons. They did really well. I wish I could tell you where the pattern was from but it's quite old.
The eight circles were cut out and then folded up to have triangles in the center.
We glued them all together to make the "ball" or octahedron. They had fun saying the word. I was going to hang them up but they all wanted to take them home.