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The taijitu is a symbol for the ancient idea that the universe is composed of opposite forces, defined in relation to each other, each arising from and giving rise to the other, and each containing the seed of the other. These two are usually called yin and yang, and are usually rendered in black and white. In this rendering, however, we keep the two lobes the same color, and differente them only by their depth, so that the figure more properly represents the idea that yin and yang are not truly opposites, but are complementary reflections of each other.