I was thinking about the two sides of the coin.  It is related to the scientific fact: Opposite poles attract.  Then came this song on the background. We never really can experience darkness without the concept of light.  We never can appreciate the value of a person when they are just there.  We are just too comfortable and familiar with each other until we let them go. We shoo them away by our mean words, thoughtless deeds, immature ways.  Then they are gone. Life is...