Click the green flag and watch.
@3TheHedgehogCoder3 made the original project before I made my remix of @pickasaurus's project (see below), but I didn't notice it before. But I'm glad I didn't, because I was delighted to discover that we accomplished the same effect using quite different methods. Seeing someone else solving a problem in a different way than me is always enlightening :) The thing I love most with @3TheHedgehogCoder3's project is the multiple waves, so I decided to go a little wild with that. The effect looks a bit like a candle flame sometimes. The projects I referred to above are "list wave" by @pickasaurus: https://scratch.mit.edu/projects/579229329/ and my remix: https://scratch.mit.edu/projects/606436812/