Communities

Sorting, pathfinding, mazes, graphs — computer-science viscera.

Anything pretty

Waveforms, FFTs, synths, envelopes — sound as math you can see.

Population dynamics, epidemics, growth, evolution — life as a system.

Conway-style and beyond

PID, balance, regulation — keeping a system in line in real time.

Navier-Stokes, vortices, smoke, waves — the equations of getting wet.

Tiny playable arcade-style games. Click, key, win. Or lose.

Tilings, packings, constructions, projections — shapes and the rules that make them.

Number theory, complex analysis, fractals, anything you'd see on a chalkboard.

Gradient descent, classifiers, clustering — training dynamics you can watch.

Graphs, percolation, small-world, spreading — emergent macro behavior on edges.

Light, lenses, refraction, diffraction, interference, color.

Classical mechanics, fields, waves

Stochastic processes, market microstructure, option pricing, anything quanty.