The sun is considered yang, the moon yin. These mudras are obvious yin and yang counterparts. Scientific research has not supported the existence of "qi", meridians, or yin and yang. The fenghuang also symbolizes the union of yin and yang. It is believed that the soul contains elements of both yin and yang. Yin and yang also applies to the human body. The Taiji symbol uses black and white to represent the unity of yin and yang. Every interaction between Yin and Yang had significance. It is based on taoistic duality of yin and yang. The first is from traditional Yin and Yang philosophy. This balance refers to what could be thought of as yin and yang within yourself. Wicca's duotheism has been compared to the Taoist system of yin and yang. They're almost a yin and a yang. It is rooted in the dynamism of the yin and yang. I definitely believe in a yin and yang, good and evil.