To learn more about various aspects of the Yin-Yang Symbol, and the Taoist philosophy that it represents, I recommend the following essays:
Introduction To The Yin-Yang Symbol. A look at what makes Taoism's approach to working with opposites - as a fluid and ever-shifting "dance of opposites" - such a liberating one.
Gender & The Tao. A closer look at the masculine/feminine polarity, and the role of women in Taoist practice.
Polarity Processing Techniques. Specific practices - utilizing journaling and meditation - to help us relate to opposites in the way suggested by the Yin-Yang Symbol.
Taoist Cosmology. How do Yin & Yang relate to qi (chi), the Tao, and the Five Elements? This is Taoism's story of the creation and maintenance and continuous transformation of the universe.
Of Related Interest:
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