“Just recycling some building blocks here”, I heard Simon say Monday.
Simon put the project on GitHub the following day.
Direct link to the animation (click on the canvas to make the bubbles appear): https://simon-tiger.github.io/bubbles/
You can also both the code and play with the animation via the p5.js web editor (hit Download to get the animation on your computer): http://alpha.editor.p5js.org/simontiger/sketches/r1l_4Gg6l
A couple videos of the making of: