Which principle focuses on the visual path of motion from one pose to another?

The principle that focuses on the visual path of motion from one pose to another is the arc. This principle is integral to animation as it helps to create a sense of natural movement. When animators use arcs, they ensure that the motion appears fluid and dynamic, rather than stiff or mechanical. Many natural movements, whether they be human gestures or the motion of animals and objects, follow curved paths rather than straight lines, and employing arcs in animation captures this quality effectively.

Using arcs contributes to smoother transitions between poses, enhancing believability in the animation. This technique aligns with the way forces and gravity interact with moving objects in real life, allowing the viewer to perceive a more convincing sense of weight and flow. The presence of arcs in motion not only improves the aesthetic aspect but also aids in communication of character emotion and intent, enriching the storytelling aspect of the animation.

Timing, squash and stretch, and secondary action, while vital principles in animation, do not specifically address the visual trajectory of motion between poses as directly as arcs do. Each of those principles serves a different purpose in creating realism and appeal in animation.