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Kids love cardboard shipping boxes. The idea is to make a light weight collapsible container that kids can transform into different imaginary worlds. It can be a house, a cave, a store, a stage, a screen... you name it. In its collapsed form it stores easily and can be a small platform.
It will be made of recycled plastic with interior corrugations for strength and durability. The plastic can me marked up with dry erase markers and then wiped clean. Connector strips along one side make the structure stable.