What does the principle of animation known as 'arcs' aim to replicate?

The principle of animation known as 'arcs' aims to replicate curved actions. This concept is grounded in the observation that most natural movements, whether they involve humans or animals, tend to follow an arcing path rather than proceeding in a straight line. By incorporating arcs into animations, creators can produce more fluid and realistic motion.

When characters or objects move in arcs, it mimics the way they would move in real life, creating a sense of weight and presence. For instance, the swinging of a pendulum, the flight of a ball, or the natural movement of limbs all adhere to this principle, enhancing the believability of the animation. This attention to detail helps engage viewers by making motion appear more organic and less mechanical.

The other options, while they represent different types of movement, do not contribute to the same fluidity and realism that arcs provide in animation.