Are you uneasy with concepts like standing wave ratio (SWR) or impedance? What does impedance mismatch mean? Watch this 30 minute film from 1959 and you will actually see them in action: https://youtu.be/DovunOxlY1k Sixty years ago teaching methods were quite different, but still effective today!
I remember one of my physics teachers using this model in class. Unfortunately, he always presented abbreviated experiments, and the true beauty of this demonstration was glossed over.
As a ham, I especially appreciate the 1/4 wave stub shown in this video.
There is so much here to see and wonder at.