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slow-in-out-mastery

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Use when designing easing curves, controlling motion pacing, creating natural acceleration/deceleration, or making movements feel physically grounded.

skills/11-by-principle-focus/slow-in-out-mastery/SKILL.md

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# Slow In / Slow Out Mastery

## The Physics Principle

Objects in the real world don't move at constant speeds—they accelerate from rest and decelerate to stops. Slow in/slow out (also called ease in/ease out) captures this fundamental truth. Without it, animation looks mechanical. With it, motion feels alive.

## Core Theory

**Slow Out** (Ease Out): More drawings clustered at the start of a movement. The object accelerates away from its starting position gradually.

**Slow In** (Ease In): More drawings clustered at the end of a movement. The object decelerates into its final position gradually.

**Linear motion**: Equal spacing between positions. Rare in nature, useful for mechanical elements or stylistic choice.
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