When taking time to study the natural world, patterns start to emerge. For example, most trees and many other plants, branch out into groups of three. This pattern of three attracts the human eye, and is the basis of the rule of thirds, or golden ratio as it is often referred to in the art community. Now there is more to this than just making an image fit into a set of rules, to technically determine where key elements should go in a photo. As a photographer it is possible to take this concept a level further, such as using three key elements in a scene for example.
Today's image uses the concept, using three items, land, water and sky. If you add these different elements in a way that works with the rule of thirds/golden ratio you can improve the quality of your images in some situations.