The collection is deliberately selective: every demo has a clear phenomenon, meaningful interventions, live measurements, and an explicit boundary between the package engine and host-owned application logic. They are ordered by conceptual and implementation complexity.
Crystal Garden
Grow real branching dendrites, hexagonal plates or solid disks through an impurity field.
neighborhood k⁷ · k = 4 02Hex Ecology
Run a three-, four- or five-species invasion cycle and paint into the waves it forms.
census() · k up to 6 · live interventions 03Excitable Tissue Lab
Compare sparks, coherent fronts, refractory waves, and scar barriers.
isotropic neighborhood rule 04Diffusion & Mixing Chamber
Open a finite vessel where directional particles collide and reflect.
exclusion gas · seeded host model 05Wildfire Command
Tune probabilistic spread, wind, burning, ash recovery, and regrowth.
O(6N) probability · interventions 06Outbreak Counterfactuals
Replay one random exposure schedule with and without vaccination.
paired seeded models · p = 1 − (1 − x)ⁿ 07Butterfly Microscope
Paste a rule, flip one cell, and watch every disagreement glow red.
snapshot XOR · red overlay 08Cellular Synthesizer
Turn births from spinners, gliders, or crystals into a visible score.
exact ticks · Web Audio host 09 · MOST COMPLEXHex Matter
Paint and pour eight materials with transport, combustion, and quenching.
block k³ · k = 8 · material brushReference instruments