The feedback loop of physical objects
In the physical world, when you press a mechanical button or flip a switch, you receive immediate multimodal feedback: an audible click, a tactile resistance threshold, and a visible change in position.
Too many digital web applications discard this physical intuition. When a user clicks a button and nothing changes for 300 milliseconds, they instinctively wonder: "Did my tap register? Is the system frozen?"
Principles of restrained motion
Animation should never exist as decoration; it must serve as spatial orientation. A drawer should slide out from the origin of tap, a modal should expand from its trigger card, and a state change should transition with natural spring damping rather than rigid linear easing.
Crucially, motion must always respect accessibility settings. When users enable prefers-reduced-motion, all non-essential spatial transitions should immediately collapse into subtle opacity fades.