The book tells about the dualism of the universe in the traditions of the peoples of the world, myths about twins and androgynous-twin rites. The process of human life is considered as a double zodiac in astrology, human bioenergetics and tantra yoga in the Indian tradition, Dan Tien centers in the Taoist tradition. Attention is paid to the law of the unity of opposites, which explains the trinity of the world and helps to understand the symbol of the trinity in the religions of the peoples of the world.