As we have mentioned above, that Nature can be referred to as Tai Chi, this Chinese word means Large and Center. In which the word Large refers to outside environment and Center refers to the entity itself. That means each Tai -chi keep in touch with the outside environment and is fed by or feed back to outside and each Tai-chi contains the factor of internal factor (Yin) and external factor (Yang) by itself. That is why Tai chi can derive to Yin and Yang.

Now you might want to have more understanding of Yin and Yang. According to their nature. Yin And Yang can be seen when there are comparisons (relativity). It is interesting to point out again that Yin or Yang are not in absolute nature but are defined on a matter of degree. How large is Large and how small Is Small? It depends on the comparison with a standard. Whether a direction is Going Out or Coming in depends on where you stand and how you look at it. However, Yin and Yang can still be separate in a general sense according to normal criteria.

Yang : abstract; far; unstable; large; external; heat; rise; superficies; asthenia syndrome, etc.

Yin : concrete; near; stable; small; internal; cold; fall; interior; sthenia syndrome, etc.