Animals struggle with each other for food or for leadership, but they do not, like human beings, struggle with each other for thatthat stands for food or leadership: such things as our paper symbols of wealth (money, bonds, titles), badges of rank to wear on our clothes, or low-number license plates, supposed by some people to stand for social precedence. For animals the relationship in which one thing stands for something else does not appear to exist except in very rudimentary form.