Every beginner in photography does one mistake which professionals don't like i.e. keeping subject in the center of the frame. He must have been bombarded for not doing that mistake again by seniors . This place is considered having less visual attention of the viewer. A subject in center divides the frame equally & may confuse the viewer where to look at? This offers a less visual weight to the subject.As soon as subject is moved from the center of the image gets a dynamic feel from a static. The golden point according to very famous rule of composition which is Rule of thirds. Image1: Egg in glass In this image I have placed the egg in center of the frame but is it really not visually interesting? The answer is yours since it is going to be subjective. I think dividing the entire frame using shapes of circles helps the viewers eyes to recognize the subject with an ease ( Ref: Gestalt Law of grouping ) . So the egg in the centered portion doesn't matter to much, in fact...