Sòngdài de Zhōu Dūnyí huà le yì fú tàijítú, yònglái shuōmíng wànwù de shēngchéng.
Zhou Dunyi of the Song dynasty drew a Taiji diagram to explain how all things come into being.
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The black and white halves are 阴 and 阳, and each holds a dot of the other, showing that every extreme carries the seed of its opposite. The red and blue circle on South Korea's flag is the same symbol.