Yin and Yang; The Concept
The concept of yin and yang is an ancient Chinese philosophy, which is fundamental to all natural sciences.

Based on this theory, ancient people's thinking was broader, hence they were aware of a great deal more, and thoughtfully considered every phenomenon that they encountered.

Quite naturally, the concept of yin and yang was incorporated into TCM, and became an important aspect of TCM theory.

What are yin and yang?
In short, the concept holds that every thing and/or phenomenon in the universe has two aspects, known as yin and yang, which oppose, complement and counterbalance each other.


Some examples are shown in Fig.1.
If you can not determine whether something is yin or yang, please see Fig.2.
Fig.1
yin yang
the earth the heaven
inside outside
stability movement
coming in going out
the night the day
cold heat
falling rising
slowpulse rapid pulse
Fig.2
yin yang
hypofunctional hyperfunctional
calm exited
cold hot
standing still moving
weak strong
dark bright
visible invisible
heavy light
turbid clear
downward upward
inward outward
inactive active

to be continued ...