The Five Elements or Wu Xing — Meaning, Formation, Content, History, and Application
What Is the Five Elements Theory?
How Are the Five Elements Formed?
Generating and Restraining Cycles.
Origin and Development in History.
The Five Elements in Chinese Astrology and Calendar.
Application of Five Elements Theory in Chinese Medicine and Food Therapy.
Utilization of The Five Elements in Names.
Five Elements in Feng Shui Culture.

The Five Elements in Chinese Culture, Picture from RayRenault.
What Is the Five Elements Theory?
Five Elements, also named Wu Xing or Five Phases, is the essence of ancient Chinese Philosophy and Cosmology.
It defines the nature and attributes of everything in the universe and its movements and concludes the fundamental theories regarding how ancient Chinese perceived the world.
Throughout history, it has been widely used in many traditional cultural fields, such as astrology, traditional Chinese medicine, name, diet, Feng Shui, etc.

How Are the Five Elements Formed?
Taiji
In ancient Chinese Cosmology, the whole universe was believed to be undifferentiated and the oneness.
This is Taiji, the beginning of the cosmos.

Yin and Yang
Gradually, the movement of Taiji evolves the Yin and Yang.
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Yin is about contracting energy, which is downward, passive, dark, accumulated, introverted, feminine, and quiet.
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Yang is about releasing energy, representing upward active, bright, expand, exocentric, masculine, and lively.
Everything in the world has both Yin and Yang side; they are in constant motion and mutual transformation.

Four Images
The motion of Yin and Yang, then, generates the Four Images.
The Four Images, Lesser Yang - Greater Yang - Lesser Yin - Great Yin, can be:
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Spring - Summer - Autumn - Winter, and
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Birth - Grow - Old - Die, and
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Wood - Fire - Metal - Water and
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East - South - West - North.
Five Elements
All lives birth out of and return to the earth; four seasons change under the Moon and the Sun.
So, the Moon and the Sun constitute a Taiji, which contains both Yin and Yang; it corresponds to the earth on the ground.
Then the Five Elements or Wuxing are formed.
Wood
Fire
Earth
Metal
Water
Meaning and Symbolization.
The Five Elements Theory is a philosophical term in ancient Chinese culture that defines the nature and attributes of everything in the universe and its movements.
The Wood, Fire, Metal, Water, and Earth are five specific representatives, or symbols, of the Five Phases.
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Wood: growth, development, extension;
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Fire: hotness, upward, bright;
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Metal: convergence, concretion, solid;
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Water: cold, downward, circulate, nourish;
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Earth: mild, placid, neutralization.