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Yin and yang are ancient Chinese concepts which can be traced back to the Shang dynasty ( 1600 – 1100 BC ).
They represent two abstract and complementary aspects that every phenomenon in the universe can be divided into.
Primordial analogies for these aspects are the sun-facing ( yang ) and the shady ( yin ) side of a hill.
Two other commonly used representational allegories of yin and yang are water and fire.
In the yin-yang theory, detailed attributions are made regarding the yin or yang character of things:

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