A rabbit is running into its hole. You may ask, “What happened?”

    Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they run too. They know that there is danger. The rabbit has told them something without making a sound. It has given them a signal（信号）.

    Many other animals use this kind of language. When a bee found some food, it goes back to his home. It cannot tell the other bees where the food is by speaking to them, but it does a little dance in the air. This tells the bees where the food is.

    Some animals say things by making sounds. A dog barks, for example, when a stranger comes near. A cat purrs (发出呼噜呼噜的声音) when pleased. Some birds make several different sounds, each with its own meaning.

    But human beings have something that no animals have -- a large number of words about things, actions, feelings or ideas. We are able to give each other information, to tell or inform other people what is in our mind or how we feel. By writing words down we can remind ourselves of the things what have happened, or send messages to people far away. No animals can do this. No animals has the wonderful power of language.

    No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.

    People living in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for example, contains four or five hundred thousand words. But we do not know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we meet a new word, look it up in the dictionary. A dictionary is the most useful book.

    Every artist knows in his heart that he is saying something to the public. Not only does he want to say it well, but he wants it to be something that has not been said before. He hopes the public will listen and understand what he wants to teach them, and what he wants them to learn from him.

    What visual(视觉的)artists like painters want to teach is easy to make out but difficult to explain,because painters translate their experience into shapes and colours, not words. They seem to feel that a certain selection of shapes and colours, out of countless billions of, is exceptionally interesting for them and worth showing to us. Without their work we should never have noticed these particular Shapes and colours. or have felt the delight which they brought to the artist.

      Most artists take their shapes and colours from the world of nature and from human bodies in motion and at rest; their choices indicate(指示)that these aspects of the world are worth looking at, that they contain beautiful sights. Contemporary(当代的)artists might say that they merely choose subjects that provide an interesting pattern, that there is nothing more in it. Yet even they do not choose entirely without reference to the character of their subjects.

    If one painter chooses to paint a decaying(腐烂)leg and another a lake in moonlight, each of them is directing our attention to a certain aspect of the world. Each painter is telling us something, showing us something, emphasizing something-all of which means that, consciously(有意识地)or unconsciously, he is trying to teach us.