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"The term yin-yang first appeared in The Book of Changes, 'Yin and yang reflect all the forms and characteristics existing in the universe'...The natural world could be seen as having a dual aspect, day and night, brightness and dimness, movement and stillness, upward and downward direction, heat and cold, etc... 'Water and fire are symbols of yin and yang.' When yin predominates, yang will be diseased. When, yang predominates, yin will be diseased'" (Cheng, 1987, p. 11-12).