The NEGATIVE SPACE allows DOMINANCE in this photo because the photographer wants us to focus on the silhouettes of the person and the hill. The galaxy and the sky in the background is the SUBORDINATE subject.
The red rose glowed in the pale blue light of the full moon. As he looked at it he was reminded of a time long ago, of the woman he had lost through his arrogance. This gleaming rose was the last of her he had to treasure.