Because of this relationship everything has its own polarities. When there is right there is wrong. When there is good, there must be bad. When there is unity, there must be division. When there is movement, there must be rest.
Polarities are the basis for all that exists in the world.
One does not exist by itself but always with its counterpart. Thus yin presupposes the existence of yang, just as yang presupposes yin at the same time. YIN is the universal symbol of the female, yeilding, tenderness, responsiveness, earth, cold, moon, inside, below, darkness, stillness etc. YANG is the counterpart of yin representing the universal symbol of male, firmness, creativity, heaven, warmth, sun, outside, above, light, motion etc. They are everywhere and at everytime.