Duality is presented in mythology through contrasting themes and figures, such as good versus evil, life versus death, and creation versus destruction. Many myths feature dualistic deities or entities, representing complementary forces that coexist, like Yin and Yang in Chinese philosophy. This concept is prevalent in stories like those surrounding Osiris and Set in Egyptian mythology, where one symbolizes life and the other, chaos. Duality often reflects the balance necessary for harmony in the universe, illustrating how opposites can reinforce and define each other within mythical narratives.