The Matter of Temper
The black and white are colors polarities for each other, they are different at everything and they are actually the colors they are the base for all others. They are colors of different energy and different emotions. Those are polarities and they may be an example to explain the difference between those people who are polarities for each other.
It is the matter of temper that makes people different from each other and that makes them polarities. There are calm people who prefer the calm and peace in their lives and there are wild people who can't stay at one place for a long and they can't stay in calm because it is like a death for them. They are always in rush for something and they are always running somewhere.
Though, any wild energy can't live wild for a long, there should be something that stops it from time to time in order it is not destroy itself and those who prefer calm before everything are people who can stop the wild ones. And the wild ones are those people who can save the calm one from the boring and dull life. They are polarities that supplement each other.
It is the matter of temper and people of different tempers are thirsty for each other because together they form something special and perfect that doesn't exist in this world, it is not natural but created by people.