The yin-yang symbol, which is widely used in Chinese culture, has its origins in Taoism/Daoism, a Chinese religion and philosophy. Shadows, femininity, and the crest of a wave are represented by dark swirls; brilliant swirls signify brilliance, passion, and expansion; and the yin swirl depicts the summit of a wave.
We all have a yin and yang spirit — and how we might achieve a healthy balance of both in our lives.