Prototype Lab

Prototypes answer decisions. They are not low-quality versions of production and not a collection of minor style tweaks.

The entire value of this skill is divergence. Three tints of one idea waste the switcher — the user learns nothing by flipping between them.

Quick reference

Need	Read
Product job, hierarchy, restraint, working order	`references/interface-principles.md`
Radius, optical alignment, elevation, materials, gradients, icons	`references/surfaces-and-depth.md`
Whether to animate, easing, duration, interruptibility	`references/motion-principles.md`
Drag, swipe, velocity, boundaries	`references/gesture-physics.md`
Semantics, keyboard, focus, hit areas	`references/accessibility-contract.md`
Evidence boundaries and feel checks	`references/evidence-and-verification.md`