If you were to cut this photo in half than everything on both sides or both sheets of paper would have the exact same portion of the picture on each side of the sheet of paper. This is called balanced composition.
If you were to cut this picture in half then the left side of the paper would have a lot more detail and show more of the picture than what the right side would. This is called UNbalanced composition.
This picture has shapes and buildings on it. The same thing is demonstrated.If you were to chop this photo in half then each side of the paper would have one full building a half of a building a little boy and a car. everything would be equal. This is called Balanced Composition: Shapes.