We frequently think of darkness as emptiness and void. In reality, darkness is a deep rich container that holds light. In fact, darkness is the womb where light is given birth. Without darkness there would be no light.
This is a crucial point to all visual arts. Remove the darkness, and there can be no light. Even a space filled with light, where no darkness seems to be present, cannot be perceived except for the darkness that contains the light. Take away all darkness, and no forms can be perceived.