To live and to continue Iife through propagation are the two instinctive desires of humans. From birth, a person's first instinct is to survive, then to live a long life. However, life and death are immutable laws of nature. Therefore, they turned to seek perpetuity after life, praying for longevity for the living, and perpetuity for the dead. Since the eternity of life could only be achieved through propagation, producing children and grandchildren to pass on life from generation to generation became the ultimate goal. Thus, human perception of propagation was the same as their perception of life itself. Propagation of people and harvesting of crops were deemed as good fortune. In this way, fortune and longevity became the basic cultural consciousness of the people, which was also the main theme of folk art.