Yin / Yang: Two halves that together complete wholeness. Yin and yang are also the starting point for change. When something is whole, by definition, it’s unchanging and complete. So when you split something into two halves – yin/yang, it upsets the equilibrium of wholeness. Both halves are chasing after each other as they seek a new balance with each other.
The word Yin comes out to mean “shady side” and Yang “sunny side”.
Yin Yang is the concept of duality forming a whole. We encounter examples of Yin and Yang every day. As examples: night (Yin) and day (Yang), female (Yin) and male (Yang). Over thousands of years, quite a bit has been sorted and grouped under various Yin Yang classification systems.
The symbol for Yin Yang is called the Taijitu. Most people just call it the yin yang symbol in the west. The taijitu symbol has been found in more than one culture and over the years has come to represent Taoism.
Yin Yang illustrated from the Tao Te Ching
When people see things as beautiful,
ugliness is created.
When people see things as good,
evil is created.
Being and non-being produce each other.
Difficult and easy complement each other.
Long and short define each other.
High and low oppose each other.
Fore and aft follow each other.