These are cool _ wave propagation vids too; Nils Berglund wave visualizations: https://youtu.be/v0cZjOIfwos?si=07w2Wd4dPlGmNxHp
_: photon, fluid, standing transverse,, plasma
What about longitudinal waves in plasma, superconductors, and superfluids though? https://www.google.com/search?q=What+about+longitudinal+wave...
I suppose vorticity doesn't matter that much for classical electronic circuits