English: The rule of thirds in composition is more of a guideline than a rule. This illustration depicts how geometric division of frame and movement of eye in the picture leads to the rule of thirds. Illustration identifies four important parts of the image that you might consider placing points of interest. Depicted in red these are sometimes called power points or saddle points and proponents of this placing claim that each point catch most of the eye movements in the frame. These are the points which most of the black lines depicted cross. The four equally placed blue lines crossing the power points divide the frame into nine equal parts by 1/3 - 2/3 ratio. A ratio near to Golden Ratio or Golden rectangle and first numbers in Fibonacci sequence. Illustration might also help you to creatively line up subjects with the other guiding lines to break the rule of thirds in your composition. It is important to understand before breaking it.