It is an origami box, made up of boxes that are made out of several mini origami boxes. All the tiny cubes link together.

This is a project that the whole class is taking part in so it is a real team effort. There are steps to follow and you can be folding at any stage of the process. To get to a Stage 3 Menger Sponge we will need to have folded 3000  pieces of paper!