Mutual Containing Boxes

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If the thickness (t) of boxes and height (h) of the inner box are known, the width (w), length (l) of the inner box and the width (W), height (H), length (L) of the outer box have certain relationships. H is equal to h plus t. w equals H plus 2t. W equals w plus 2t. l equals W plus 2t. L equals l plus 2t. A bigger h and a smaller t will make boxes more cubic, thus more captivating when playing with them. Conversely, using a smaller h and a bigger t is beneficial for grasping why they can fit inside each other. The original concept originates from Huang Min-Kang, a retired mathematics professor at National Taiwan University. I have created a customizable model as an easy teaching tool.