There are a bunch of YouTubers making Desmos animations. I haven’t played with it myself, but always find it fascinating with what people come up with.
Explanation of the above video: https://www.youtube.com/watch?v=6tBkJhmpfFc
https://www.youtube.com/watch?v=XvS_yBj-nDM&list=PL2lqjYK9wC...