Recreational learning & discovery
Joel Holder
Math, code, and the occasional unanswerable question — pursued mostly because I can't leave them alone.
This board is real: drag anywhere to write on it, pick a color from the tray, or grab the eraser.
Chalk tray:
I'm a lifelong tinkerer with math, code, and the occasional unanswerable question — I'd rather build a small working model of an idea than just read about it, then write down whatever I find along the way.
Why write it down?Because the interesting part usually only shows up once you've tried to explain it.
Selected work
Things I've built
Cellular automata
Automata Arcade
A playable workbench for composing, inspecting, and mutating emergent systems.
Artificial life
Evo Lumen Life
A browser ecosystem experiment with agents, energy, and evolving behavior.
Pure math
First principles of proof
A tiny proof showing how associativity and commutativity make algebra move.
Loose Leaf