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Chinese at the tip of your tongue: Culture behind the numbers
...system, which centres around an eight-sided diagram called bā guà. Bā guà was designed by Chinese philosophers about 5,000 years ago, in which the eight elements represent constant changes in the universe. There are eight diagrams in bā guà representing eight related concepts, such as heaven, lake, fire, water. At the centre of bā guà is the yin and the yang...