Platonic Solids

I'm spending a little time doing some maths with my eldest daughter (nearly five). One of the tasks we're looking at currently is constructing Platonic solids from their nets. The net of the octahedron is shown below. It was a great little exercise constructing the solid, but trying to effectively glue the flaps was tricky. PVA glue was probably a better plan than a glue stick. An interesting thing we discovered is that its possible, using the same net, to produce the concave rather than the convex octahedron