The first picture I have is a water fountain. The water is black because it is the subject. The water is the moving object. The fountain is white because it is the background. The water is positive. The fountain is negative. The water is positive because it is tangible and an aspect of design. The fountain is negative because it surrounds the positive shape.
I chose a picture of the ground with a sign. The sign is in black. The sign is the non movable object. The ground is in white. The sign is in black because it is positive. The ground is in white because it is negative. This design balances both ways equally.
The plants, dirt, cement, and grass are the scene. The plants are black because they are positive. The dirt, cement, and grass is white because it is negative. Both sides are as equally important. They both matter in all pictures. Sculptures and silhouettes contrast both ways.