The world is grate as it is. It is whole and indivisible. More of it, it has no boundaries, so if you want to cut it to white and black you will miss the rope;)
For example: let's night will be BAD thing which we want to destroy, and day will be good thing.
So, where is a bound between this two?
Nowhere.
Night is an extension of day, it is born from it, day is an extension of night in turn. In fact day is a part of night, and and vice versa;)))