Nick Strayer shows how t-SNE is similar (equivalent?) to a force-directed graph layout: https://beta.observablehq.com/@nstrayer/physics-based-t-sne
Jim Bumgardner published a tutorial that starts with drawing circles with canvas, then fibonacci spirals, then colorful sunflower seeds: https://beta.observablehq.com/@jbum/circles-spirals-and-sunf...
Kamil Slowikowski drew a lovely Barnsley Fern: https://beta.observablehq.com/@slowkow/barnsley-fern
Alan Palazzolo did a Mandelbrot fractal with randomized coloring: https://beta.observablehq.com/@zzolo/mandlebrot-set
Justin Palmer uses PROJ4JS to transform and scale a local map: https://beta.observablehq.com/@caged/local-map-projection-wi...