What principle of animation is used to animate the movements of the arms of the following character while welding?

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The movements of the characters arms follows an

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Answer: Twelve basic principles of animation were introduced by the Disney animators Ollie Johnston and Frank Thomas in their 1981 book The Illusion of Life: Disney Animation. But the principles are based on the work of Disney animators from the 1930's on wards, in their quest to produce more realistic animations. The main purpose of these principles was to produce an illusion that cartoon characters adhered to the basic laws of physics, but they also dealt with more abstract issues, such as emotional timing and character appeal.