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　　Before we can make full utilization of any subjects of study, we must at first understand their main functions and values to our society. For example, if we depend upon rituals and ceremonies to give us fortune and luck and to provide us enough to eat, we may probably die of hunger. The true value of these rituals and ceremonies lies in the fact that they are crucial part of our culture. It's the same case for science and art, if we hold the opinion that science is only to reassure people, and art is only to upset people, we can't see the importance of these two subjects to our society. It's possible that we ignore the development of them, and sequentially our society won't develop without the breakthroughs made in science, and our citizens won't lead a happy life and will stay in an ignorant status without the existence of great art works.