They blended.  All the dark and light colors.  The crimson red, pitch black and bright white.  Red was the dividing line.
   
    The boundary between the two sides.

     They could never completely pass.  They would clash, the black and white.  The light and dark. The evil and good. 

      There could only be so much dark in the world same with the light.  They must shift like the sun and moon. 

     The dark trying to pass the red and the white attempting to meet it there.  The red is us.

              Humans.

     Us creatures with a heart, a soul, and a mind.  Though not always pure, we manage to balance out the world.

   The light and dark do take on forms.

     Light is the hero in every story while the dark is the villain.  Though we keep them at bay.  We are the balance.

     We are the boundary.

Song title:  Across the line
Artist: Nightcore