I don't really see what you mean by perspectives. Yin-Yang is the balance between dark and light, good and evil, male and female, love and hate. Without one there is no other, without a balance in the world everything would be hectic. There is dark in everything light and there is light in everything dark.
Some see Yin-Yang as a perspective but in all honesty, it really is just a symbol to represent the way things are and work, though it has power. Everything has power,.
I just like to hear what people have to say on subjects just find it intriguing, I have always been a fan of Asian culture, some people would say that Lucifer to Jesus/Yahweh would be light and dark or Winston Churchill to Hitler, as a comparison or Police men/ criminal, but I suppose it doesn't really matter just wanted to find out what people think.