# Motion Emil Kowalski built two React libraries that rely on animation, downloaded together more than 90 million times a week from npm, and then wrote an essay titled You Don’t Need Animations. That is the whole chapter in one sentence. What follows is how he, Rauno Freiberg, and a few others decide when motion earns its place, and how they choose the curve, the duration, the spring, and the clip when it does. ## 7 sections 1. [You don't need animations](https://learn-ui.com/chapters/motion/you-dont-need-animations) 2. [Easing: where the speed goes](https://learn-ui.com/chapters/motion/easing) 3. [Springs and duration](https://learn-ui.com/chapters/motion/springs) 4. [Practical tips](https://learn-ui.com/chapters/motion/practical-tips) 5. [The magic of clip-path](https://learn-ui.com/chapters/motion/clip-path) 6. [Choreography and depth](https://learn-ui.com/chapters/motion/choreography-and-depth) 7. [Friction as a feature](https://learn-ui.com/chapters/motion/friction)