Yin and Yang are opposite and interdependent forces, but what
happens if the concept of opposite could apply to more than two
qualities? A third opposite force is interdependent with the two
first ones, that are dependent each other too. And so goes on with
fourth, fifth, and n-opposite force. More than two opposite and
interdependent qualities keep on Yin Yang philosophy: * Yin and
Yang are opposing * Yin and Yang are rooted together * Yin and Yang
transform each other * Yin and Yang are balanced
http://www.juanmah.com/yin-yang-yong/ (there are pictures to
represent this on the website)