The relationship between a nurse and a patient can be represented by the yin/yang. They are seemingly opposite but they actually are complementary. The healthy and the sick, the strong and the weak.
"In Ancient Chinese philosophy, yin and yang is a concept of dualism, describing how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent in the natural world, and how they may give rise to each other as they interrelate to one another." Wikipedia.
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