... Everything from the subtleties of how their hair is kept, to the look on their face, the tone of their skin, how hard they are breathing, wherethey are looking and how often, the condition of their clothing: ... stretch. The rules are this: the faster the action, the more squash and stretch youneed. The more realistic the character, the less you should use. So, acharacter like Smith who is bouncing around the ... fashion, then go back and fill in the arms, then, hair and any flowing clothes. But each time, the animator thinksabout all of the other principles and builds them into each pose as heworks. There...