Three workers were building a wall. Some people came to ask ,“ What are you doing ?” The first man said ,“ Didn't you see it ? I’m building a wall. ” The second man looked up and laughed, “ We are building a tall building. ” The third men was singing a song and his smile was bright and happy. He answered, “ We are building a new city. ” Ten years later , the first person was still a worker in another building site. The second man is sitting in the office drawing. He became an engineer. What about the third person? He's the boss of the first two. The ordinary work on your hand is actually the beginning of the big business.