Sesame Street shorts. Follow this with Parabolas (etc.), 100 people answer the question, “How old are you?” in Dutch, the Electric Company’s Sign Songs, and Design Ah! (デザインあ) introduces kids to design concepts.
How many times it happened to find similar shapes between them which seem to have any kind of relationship?
As often it happens in nature all is apparently different but essentially the basic shapes are repeated with infinite declinations. The format puts in relation objects from similar shape that have different functions.