The Rule of Thirds

The rule of thirds is a proportional rule.  It dictates that all screens, images, scenes, vignettes or anything else can be split into nine equal sections (divided by three vertical lines and three horizontal lines).  It discourages placing the horizon in the center (as this may divide the image in half) or putting the subject right in the center (as this isn’t where the eye would naturally go).  Where the imaginary lines intersect is where the eye is naturally drawn.  The rule allows the perception of the image to be much clearer and more visually appealing.