Arcs are a very important principle in animation. They are used to give an object life using spline tangents instead of linear. If you have straight in-between frames, then your animation still may seem dead. Therefore, you must implement the use of splined arcs in your animation to breathe some life into them. Gravity and joints have a lot to do with arcs as well, because gravity is always acting. Therefore, everything will have some sort of arcing motion. Also, since we are human and we have joints, our bodies will move with arcing motion, because gravity acts to shift our weight.
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