What light is this I see?

It's not a big choice, but one that we seldom think to make.
How do I want to see the world?  Am I looking through rose-colored glasses or seeing the world in the blue-tinted dawn of early morning?  That difference makes a difference.  We can see red, or think of how calm the azure sea makes us feel.  If we obscure the lens from seeing all the green, what does that leave us seeing?  No forest for the trees.  No other side is ever green, let alone greener.  Money would lose its luster.  Envy would have to turn to another colour and be jealous of it. 
So, where in the scale does your light shine?  It's no small wonder that red was chosen to serve as a brake light.