Entry for the 2021 JS1024 contest.
"Create a javascript/shader program that has 1024 bytes or less and make it do something cool."
I played around with this technique of making a "particle-font" a couple of years ago. It works by first drawing some text on canvas and then finding all pixels that are filled. I then scale the x,y coordinates of those pixels to get the position for each particle. The rest is a really basic "physics" system where dots are pushed away from the mouse and drawn towards their original position.