Do we have only our world? Answer is not. There are worlds infinity. For example, many people are existence. Human society consist of strong power and weak power. Human have person who have strong influence and person who have weak influence. This world is the survival of the fittest. We can see easy conspicuous person, but we can see difficult plain person. In the same, world have strong world and weak world. We can see easy strong world, but we can see difficult weak world. Weak world is existence surely, but strong world twist weak world down. We think that we have only our world. Our world is strongest than other worlds. So, we can see only our world.