I am very much a Western type esoteric but I've always appreciated the surface level of Yinyang and basic Law of Polarity as it plays out everywhere above, below, within, without. I've been doing a little bit deeper delving into the actual Eastern philosophies though, starting with this article and picking up Yinyang
The Way of Heaven and Earth in Chinese Thought and Culture by Robin Wang.
What are other people's thoughts about Yinyang as a universal principle and especially the Eastern philosophies that have it at their core?