01 TaiJi and Yin-Yang
White represents Yang (outward, warm, rising, active), and black represents Yin (inward, cool, descending, still). Yin and Yang are not good-vs-bad; they are complementary.
The S-shaped dividing line shows that Yin and Yang wax and wane with time and context. The opposite-color dots show that each side contains the seed of the other, so transformation is always possible.
The core of Yin-Yang is not a fixed label but a dynamic relationship: Yin can transform into Yang, and Yang can transform into Yin. Understanding this waxing, waning, and transformation is essential.
For example, within one day, morning shifts from Yin toward Yang, noon is the peak of Yang, and evening shifts back toward Yin. Across a year, Yang grows through spring and summer, then after the summer solstice Yin gradually rises through autumn and winter.