
Design is a science as much as an art, and UX design is one of the areas where that is, or at least should be, extremely apparent. UX design is about crafting experiences that work for users, with form subservient to that experience.
You might be familiar with Disney's 12 principles of animation, which set out a kind of rule book for creating moving images, whether it's for films and cartoons, CSS animations or UI design. The wonderful cheatsheet below takes that concept but updates it for the scientific requirements of UX, providing 12 principles for UX design in motion.