恩格斯说,人类的生产有两种:一方面是生活资料的生产;另一方面是人类自身的生产。在古人生活资料的生产中,“天象观测”体现了阴阳思想的“循环变化”、“往复消长”两个规律,这同时也构成了阴阳思想之可能成立的质料因。在以产食文化理论为基础的“生育崇拜”中,男、女二元构成了阴阳思想产生的形式因。 Engels said that there are two kinds of human production: one is the production of living materials; the other is the production of human beings themselves. In the production of the ancients’ life materials, “Astronomical Observations ” embodies the two rules of “cyclic change” and “reciprocal growth” of yin-yang ideology, which also constitutes the material reason for the establishment of yin-yang ideology. In the “worship of procreation” based on the theory of food culture, male and female duality constitute the formal cause of the yin-yang ideology.