This picture represents simplicity because the only object in the picture is the statue. The background color is also not similar with the object, giving all the attention to the statue.
The two objects in this picture are not placed in the middle. They are placed on the lines of the Rule of Thirds. Giving the objects more appeal.
This picture is avoiding mergers because the old and dirty tennis ball is in the back of the picture, while the new ones are in the front. Separating the old from the new.