Recreational learning & discovery
Joel Holder
Math, code, and the occasional unanswerable question — pursued mostly because I can't leave them alone.
The shape behind this page never sits still, lit by three colored lights in slow orbit. Drag to orbit it yourself, scroll or pinch to move closer.
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