Rules of thirds

The guideline proposes that an image should be imagined as divided into nine equal parts by two equally-spaced horizontal lines and two equally-spaced vertical lines, and that important compositional elements should be placed along these lines or their intersections

 A subject in line with these points helps creates an interest in the shot which simply centring the subject could not achieve . Here i feel it makes the shot much more interesting it also make it much more aesthetically pleasing to an audience which helps in the overall feel and immersion of the viewer  in the scene .