This lesson is meant for Middle school or higher. The concepts required for understanding are beyond most elementary minds. This unit involves using recycled materials on a flat surface, to make a visual composition in 3D, but not meant to be sculptural, "in the round", so to speak. Further, it requires the use of tools that require competence and safety.
The lesson is simple, but the implications are grand, and deep, in terms of the implied theme and composition. Try not to give away the idea with too many Art Historical examples.