The quality of the explanations, and progression of complexity, reminded me of an old video that explains how a car's differential (rear end) works:
https://www.youtube.com/watch?v=yYAw79386WI
Skip to 3:30 for the explanatory part.
https://www.youtube.com/watch?v=yYAw79386WI
Skip to 3:30 for the explanatory part.
I also appreciated the humor. They seem to have built a working mockup of a car with the driveshaft penetrating the passenger compartment, just to make the joke that it would be inconvenient to rest luggage on the spinning shaft.