Wayne Dixonn gives the answer at the end of the video, giving meaning to the set.
A simple animation with a shader that represents only the contours to simulate the stroke of a pen, in so-called “Not photorealistic“, serves one purpose: perform “your question”.
If you want to know wave response have to see the whole video, although only two minutes..
I recently finished a personal project where I used blender in the creation of a custom made flip book, the purpose of which is clear by the end of the video.
I leave the link at the end.
Seen in Blender Nation