PMP®:CAPM® - Versus - The Opposites

The world is filled with opposites. There is a balance between such opposites as depicted by the yin yang symbol of the Chinese.

Few of the opposites we observe in the world are as follows.
Light and dark
Fire and water 
Expanding and contracting
Sun and Moon
Sun rise and Sun set

Sometimes people who are together may have opposite view points.I once wrote the below joke.
A man says to his friend,"I don't believe in astrology"
His friend responds by saying, "You may be like that as per your zodiac"

Let us see some of the opposites in the Project Management.