Yinyang (yin-yang) is one of the dominant concepts shared by different schools throughout the history of Chinese philosophy. Just as with many other Chinese philosophical notions, the influences of yinyang are easy to observe, but its conceptual meanings are hard to define.
Despite the differences in the interpretation, application, and appropriation of yinyang, three basic themes underlie nearly all deployments of the concept in Chinese philosophy: (1) yinyang as the coherent fabric of nature and mind, exhibited in all existence, (2) yinyang as jiao (interaction) between the waxing and waning of the cosmic and human realms, and (3) yinyang as a process of harmonization ensuring a constant, dynamic balance of all things. - from the Internet Encyclopedia of Philosophy
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