Black and white, day and night, good and evil.... all representing each other's opposite. Because life is full of opposite things that sometimes don't make much sense.
For example, one day you may be happy, but the next one you may be sad. And it's normal... no one can be happy all day. So don't worry.
The Black & White Cap screams I am someone special, as everyone is going to notice you when you are wearing it due to the strong presence of the opposite element on it.