What is yin-yang theory?

The yin-yang theory states that all things in the universe are governed by opposing, yet interdependent forces. Yin represents the passive and yang represents the active. One can find many ways to describe these opposing forces like night and day, or cold and hot.

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And another question, what does yin and yang mean friendship?

Yin is said to be dark and feminine, while yang, light and masculine. One flows into the other... just like the light into darkness. It's true, opposites do attract, with lovers, and also friends. The principal of Yin and yang shows that opposing forces are invaluable. Because each needs the other to coexist. Consequently, what happens if yin and yang are unbalanced? Yin and yang are in constant flux. If one becomes unbalanced in the body, illness occurs. For example, since yin is cold, an excess of yin can cause illnesses such as insomnia and dry-mouth. Conversely, a yang deficiency can cause cold limbs and a sickly-complexion.

Is yin the moon?

It's easy for people to understand the philosophy by talking about the sun (Yang), moon (Yin) and universe. After observing the universe, the ancient Chinese found that the universe is changing every day. And another question, is a yin yang tattoo offensive? In terms of cultural appropriation most Asians aren't going to be offended by a yin yang tattoo.

Subsequently, is the yin black or white?

Yin is the black side, and yang is the white side. The relationship between yin and yang is often described in terms of sunlight playing over a mountain and a valley.