Interface physics and interaction ethics

Purposeful motion as interface continuity

Motion is not decoration; it is spatial continuity with a clear point of view. When elements shift state, their trajectory should explain where data lives and how the DOM recalculates layouts without disorienting the user.

Readable kinetic typography during character reveals

Dynamic word and character reveals risk cognitive load if typographic rhythm breaks. Maintaining consistent bounding boxes and font metrics during staggered entrance animations ensures legibility remains uncompromised.

Ergonomic scroll triggers respecting native velocity

Pinned storytelling and scrubbed timelines must never override native browser scroll physics. Designing scroll interactions that respect user inertia prevents scroll fatigue and maintains fluid accessibility across viewports.

Motion communicates spatial hierarchy and state changes rather than acting as decorative distraction.

Marvoyan Engineering Guidelines

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