The principle of Yin and Yang from Chinese philosophy is that all things exist as inseparable and contradictory opposites. Examples of Yin-Yang opposite forces are female-male, dark-light, and old-young
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Yin and Yang - World History Encyclopedia
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Yin, Yang, and the Nature of Change, by Will Buckingham
Yin and Yang in Chinese traditions
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The Encyclopedia of Eastern Philosophy and Religion: Buddhism
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Yinyang (Yin-yang) Internet Encyclopedia of Philosophy