https://fundamental-engine.com/writings Research, releases, features, and notes on Fundamental — the platform-native relational field runtime. en-us Thu, 02 Jul 2026 00:00:00 GMT hi@zachshallbetter.com (Zach Shallbetter) hi@zachshallbetter.com (Zach Shallbetter) https://fundamental-engine.com/writings/meaning-should-have-behavior/ https://fundamental-engine.com/writings/meaning-should-have-behavior/ Thu, 02 Jul 2026 00:00:00 GMT Zach Shallbetter note Interfaces let anything claim importance because claims are free. The argument for making meaning exert consequences — conservation as the law, receipts as the proof. https://fundamental-engine.com/writings/fundamental-for-developers/ https://fundamental-engine.com/writings/fundamental-for-developers/ Mon, 29 Jun 2026 00:00:00 GMT Zach Shallbetter note Not an animation library, not a particle background — a relational field runtime for interfaces. The conceptual shift, the lane model, field vs force, the Natural Fields, designed-vs-natural, dimensions and coupling, agents, signals-first feedback, and the practical developer rules. https://fundamental-engine.com/writings/the-bats-had-momentum/ https://fundamental-engine.com/writings/the-bats-had-momentum/ Mon, 29 Jun 2026 00:00:00 GMT Zach Shallbetter note In 1992, Reynolds' boids gave Batman Returns its swarming bats and its army of penguins. Fundamental descends from the same model — but it's missing the thing that made those creatures feel like matter: momentum. Here's the idea to add it, and what we'd expect. https://fundamental-engine.com/writings/09-field-interfaces-semantic-substrates/ https://fundamental-engine.com/writings/09-field-interfaces-semantic-substrates/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A generalizing theory paper that lifts the Fundamental field model into a portable, falsifiable principle for treating relational UI meaning as a first-class semantic substrate. https://fundamental-engine.com/writings/10-conserved-attention-interface-systems/ https://fundamental-engine.com/writings/10-conserved-attention-interface-systems/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research An HCI argument that interface attention is a finite, transferable budget — emphasis gained somewhere must be paid for elsewhere — generalized from the Fundamental engine's shipped conserved-attention model. https://fundamental-engine.com/writings/11-semantic-degradation-paths/ https://fundamental-engine.com/writings/11-semantic-degradation-paths/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research An interface principle: every expressive channel (motion, color, particles, glow) must carry meaning that survives when the channel is removed, generalized from the Fundamental field model. https://fundamental-engine.com/writings/12-evidence-graphs-ai-trust-calibration/ https://fundamental-engine.com/writings/12-evidence-graphs-ai-trust-calibration/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: source-backed AI interfaces should expose evidence as a claim-level graph of support, contradiction, uncertainty, and provenance rather than inline citations and confidence badges. https://fundamental-engine.com/writings/13-runtime-inspectable-interfaces/ https://fundamental-engine.com/writings/13-runtime-inspectable-interfaces/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle arguing that systems should expose runtime-inspectable, reveal-never-mutate explanations of their own behavior, generalized from Fundamental's diagnostics. https://fundamental-engine.com/writings/14-recipes-behavioral-design-tokens/ https://fundamental-engine.com/writings/14-recipes-behavioral-design-tokens/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A design-systems argument that interface behavior — motion, attention, evidence, priority, relationships — can be carried by named, validated, inspectable patterns the way visual design tokens carry style. https://fundamental-engine.com/writings/15-data-binding-beyond-views/ https://fundamental-engine.com/writings/15-data-binding-beyond-views/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research An expansion paper generalizing Fundamental's data-binding claim into a portable interface principle: bindings should preserve relationships, uncertainty, priority, lifecycle, and provenance, not just sync views. https://fundamental-engine.com/writings/16-semantic-canvas-problem/ https://fundamental-engine.com/writings/16-semantic-canvas-problem/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: keep semantic HTML canonical and bind canvas/WebGL/SVG visuals to it as secondary, falls-back-able representations. https://fundamental-engine.com/writings/17-interaction-truth-modes/ https://fundamental-engine.com/writings/17-interaction-truth-modes/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable taxonomy for labeling interface behaviors by epistemic mode — simulated, measured, inferred, expressive, diagnostic, decorative, or metaphorical — generalized from the Fundamental field runtime. https://fundamental-engine.com/writings/18-field-based-wayfinding-long-form-documents/ https://fundamental-engine.com/writings/18-field-based-wayfinding-long-form-documents/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: long-form documents should externalize reader position, history, and section relationships as a measured wayfinding field, with a falsifiable model and conformance plan. https://fundamental-engine.com/writings/20-non-perturbing-diagnostics/ https://fundamental-engine.com/writings/20-non-perturbing-diagnostics/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: diagnostic layers must reveal behavior without becoming part of it — read-only, separable, and auditable — generalized from the Fundamental paper family. https://fundamental-engine.com/writings/21-host-driven-ui-runtimes/ https://fundamental-engine.com/writings/21-host-driven-ui-runtimes/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A systems-paper generalization of Fundamental's FieldHost seam: isolating all environment contact behind an explicit host interface so a UI behavior core runs across browser, headless, worker, and native targets. https://fundamental-engine.com/writings/22-accessibility-conformance-expressive-interfaces/ https://fundamental-engine.com/writings/22-accessibility-conformance-expressive-interfaces/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable, falsifiable conformance model for expressive interfaces: schemas, lint, previews, source-of-meaning traces, and channel-equivalence checks that make accessibility claims testable beyond Fundamental. https://fundamental-engine.com/writings/24-interface-memory/ https://fundamental-engine.com/writings/24-interface-memory/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable HCI principle drawn from the Fundamental field runtime: interfaces should remember meaningful attention — dwell, revisitation, reading trails — as a legible, inspectable memory surface. https://fundamental-engine.com/writings/25-semantic-motion/ https://fundamental-engine.com/writings/25-semantic-motion/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: animation becomes semantic when it carries meaning, and such motion must be authored, tested, and degraded differently from decoration. https://fundamental-engine.com/writings/26-field-based-evaluation-methods/ https://fundamental-engine.com/writings/26-field-based-evaluation-methods/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable methods framework for evaluating field-based interfaces — orientation, trust calibration, accessibility equivalence, time-to-diagnose, and semantic preservation, not just task completion. https://fundamental-engine.com/writings/27-taxonomy-interface-participants/ https://fundamental-engine.com/writings/27-taxonomy-interface-participants/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable taxonomy generalizing Fundamental's interface-participant model: anything that emits, receives, stores, transforms, or explains interface state participates — rendering is just one role. https://fundamental-engine.com/writings/23-relationship-registries-interface-primitive/ https://fundamental-engine.com/writings/23-relationship-registries-interface-primitive/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A systems-HCI bridge paper arguing interface relationships should be explicit, typed, inspectable runtime objects rather than incidental layout, prose, hidden state, or ARIA hints alone. https://fundamental-engine.com/writings/28-layout-to-topology/ https://fundamental-engine.com/writings/28-layout-to-topology/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A theory paper generalizing Fundamental's relational-field model into a portable principle: layout arranges boxes, topology exposes meaning relationships, and complex interfaces need both. https://fundamental-engine.com/writings/29-ai-interfaces-show-support-not-sources/ https://fundamental-engine.com/writings/29-ai-interfaces-show-support-not-sources/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A position paper arguing AI interfaces should surface claim-level support, contradiction, uncertainty, and provenance rather than treating attached citations as proof. https://fundamental-engine.com/writings/30-platform-native-expressive-systems/ https://fundamental-engine.com/writings/30-platform-native-expressive-systems/ Sat, 27 Jun 2026 00:00:00 GMT Zach Shallbetter research A portable interface principle: layer expressive behavior on semantic HTML while keeping the DOM canonical, bindings inspectable, and every expressive channel optional. https://fundamental-engine.com/writings/one-engine-four-runtimes/ https://fundamental-engine.com/writings/one-engine-four-runtimes/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature Fundamental's physics lives in a core that imports zero DOM. Every runtime — web, Three.js, headless, native Swift — is the same engine behind a different injected host. https://fundamental-engine.com/writings/render-none-the-invisible-field/ https://fundamental-engine.com/writings/render-none-the-invisible-field/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature Fundamental ships invisible by default. The field runs the full simulation and writes its signals to the DOM while drawing nothing — you opt into pixels, you don't fall back from them. https://fundamental-engine.com/writings/the-empty-canvas-that-costs-every-frame/ https://fundamental-engine.com/writings/the-empty-canvas-that-costs-every-frame/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature A full-viewport mix-blend-mode canvas re-blends the entire screen every frame the layer below it animates — even when the canvas is empty and transparent. Here's the trap, and the one-line fix. https://fundamental-engine.com/writings/the-field-is-fill-rate-bound/ https://fundamental-engine.com/writings/the-field-is-fill-rate-bound/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature A 120→30fps homepage regression that particle count couldn't explain — and the canvas-compositing bottleneck that did. Profile by isolation; suspect the compositor before the force math. https://fundamental-engine.com/writings/the-interface-is-a-field-not-a-screen/ https://fundamental-engine.com/writings/the-interface-is-a-field-not-a-screen/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature An interface is less a screen of components than a field of relationships — priority, polarity, binding, decay — and Fundamental makes that field runnable, inspectable, and measurable. https://fundamental-engine.com/writings/the-road-to-1-0/ https://fundamental-engine.com/writings/the-road-to-1-0/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter release Fundamental isn't a release candidate yet — it's at 0.8.1, working the gate program that produces one. Here's what's already frozen, what CI proves, and the gates still standing between here and a 1.0.0-rc.1 tag. https://fundamental-engine.com/writings/the-silent-contract-gap/ https://fundamental-engine.com/writings/the-silent-contract-gap/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature The engine writes a body's feedback channels every frame, but nothing makes a CSS rule read them — so a body can react hard and look completely dead, and nothing errors. https://fundamental-engine.com/writings/your-design-system-already-has-four-forces/ https://fundamental-engine.com/writings/your-design-system-already-has-four-forces/ Fri, 26 Jun 2026 00:00:00 GMT Zach Shallbetter feature Every interface already runs on four dynamics — importance, polarity, belonging, and change — and Fundamental just makes them explicit and programmable instead of leaving them implied. https://fundamental-engine.com/writings/invisible-fields/ https://fundamental-engine.com/writings/invisible-fields/ Wed, 10 Jun 2026 00:00:00 GMT Zach Shallbetter feature Twelve ordinary page types run as fields over real data — no particle swarm; the measurement comes back as type, ink, and anchor. https://fundamental-engine.com/writings/02-reading-field/ https://fundamental-engine.com/writings/02-reading-field/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A field model for reading attention and document memory that preserves semantic HTML. https://fundamental-engine.com/writings/08-explainable-interface-behavior/ https://fundamental-engine.com/writings/08-explainable-interface-behavior/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A diagnostic framework for explainable interaction behavior. https://fundamental-engine.com/writings/03-evidence-fields/ https://fundamental-engine.com/writings/03-evidence-fields/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A field-based interaction model for evidence, confidence, contradiction, and provenance. https://fundamental-engine.com/writings/04-motion-equivalence/ https://fundamental-engine.com/writings/04-motion-equivalence/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A conformance model for translating motion-heavy behavior into static semantic equivalents. https://fundamental-engine.com/writings/07-data-as-field-participants/ https://fundamental-engine.com/writings/07-data-as-field-participants/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A data-binding model for relational interface fields. https://fundamental-engine.com/writings/05-host-driven-runtime/ https://fundamental-engine.com/writings/05-host-driven-runtime/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A runtime architecture that targets DOM, Canvas, SVG, WebGL, native, or headless. https://fundamental-engine.com/writings/06-portable-field-recipes/ https://fundamental-engine.com/writings/06-portable-field-recipes/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research A structured authoring model that composes behavior without corrupting runtime vocabulary. https://fundamental-engine.com/writings/01-field-translation-runtime/ https://fundamental-engine.com/writings/01-field-translation-runtime/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research The paradigm: UI as a shared, inspectable field of meaning. https://fundamental-engine.com/writings/fundamental-explained-simply/ https://fundamental-engine.com/writings/fundamental-explained-simply/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter note A plain-language tour of Fundamental — from invisible magnets to the deep end, and an honest look at when you'd actually want it. https://fundamental-engine.com/writings/references/ https://fundamental-engine.com/writings/references/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter research Running bibliography for the Fundamental research paper family. https://fundamental-engine.com/writings/welcome-to-fundamental-writings/ https://fundamental-engine.com/writings/welcome-to-fundamental-writings/ Sun, 07 Jun 2026 00:00:00 GMT Zach Shallbetter note A home for what we are building and thinking about — features, releases, and research — written in markdown.