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The twelfth sample fills the one classic dynamic the gallery was missing — overshoot and collapse, the dynamic Thinking in Systems is built around. A Reinforcing engine (Capital reinvesting its extraction revenue) runs on a non-renewable Resource, the first Stock in the gallery with no inflow: it overshoots the limit instead of settling at it, the dark twin of "Limits to growth". Buildable with the existing rule vocabulary (proportional only); the non-negative-stock floor tames the bilinear extraction term as the Resource runs out. Tuned against the simulator: Capital 5 → ~250 (t≈39) → ~5 by t=150, Resource 1000 → ~6, no divergence. The loop detector classifies the three loops as expected (R: investment→Capital→extraction; B: depreciation→Capital; B: extraction→Resource).
meadows
A canvas for thinking in systems — stocks, flows, converters, and feedback loops. Inspired by Donella Meadows' Thinking in Systems.
Deployed at https://meadows.apoena.dev
Design & docs
- CONTEXT.md — the ubiquitous language: Stock, Flow, Converter, Information Link, Polarity, and the Feedback Loops (Reinforcing / Balancing) the wiring forms.
- DESIGN.md — goal-driven design (QFD): goals → functions → components, the House of Quality, the performance budget, and recorded tradeoffs.
- Architecture decisions (
docs/adr/):- ADR-0001 — feedback loops are detected from structure, not stored.
- ADR-0002 — Vue Flow is the editor substrate; the domain Model is the source of truth.
- ADR-0003 — a Flow is a node; Source/Sink clouds are materialised nodes.
- ADR-0004 — simulation behaviour comes from a small fixed vocabulary of rules over Information Links, not free-form formulas.
- ADR-0005 — uPlot draws the behaviour-over-time chart; a charting dependency that earns its keep.
Stack
Vite + Vue 3 + TypeScript, Tailwind v4, DaisyUI. Lint/format via oxc (oxlint + oxfmt). SPA-only — diagram model is client-side.
Develop
pnpm install
pnpm dev # frontend on :5173
pnpm lint # oxlint (pnpm lint:fix to autofix)
pnpm fmt # oxfmt (pnpm fmt:check to verify only)
pnpm build # type-check + production build (what Coolify runs)
Deploy
Pushes to main are picked up by Coolify at https://platform.apoena.dev.