What is a yin-yang fish?

These figures are formed by the intersection of two pairs, or a double dragon, a double snake, a double fish and a double phoenix. Even ""is formed by the intersection of two identical symbols, which is the product of reproductive worship in primitive society. Double stripes, or male and female (Fuxi, Nuwa), or male and female (Pisces, double snakes, double dragons, double birds); The intersection of pairwise reflects primitive people's intuitive understanding of sexual intercourse between men and women. From the human phenomena, biological phenomena and natural phenomena such as hermaphroditism, men and women, the sun and the moon, we gradually realize the concept of "Yin and Yang", as well as the ideas of androgyny, the relative and intersection of Yin and Yang (treatment and unity), the interaction of Yin and Yang, and the mutual transformation of Yin and Yang, which determine that the traditional culture of China is Yin and Yang culture in a certain sense. The Yin-Yang hexagrams and Yin-Yang hexagrams in the Book of Changes are symbols of Yin-Yang thoughts (line symbols), and the combination of black and white in Taiji diagram is the best illustration (graphic symbol) of Yin-Yang's thoughts of unity, popularity and interaction.