The Golden ratio, also often called the Golden Section or the Golden Mean, is a ratio that can be used to create visual harmony in a picture. This ratio, specifically the ratio 1:1.618…, can be found in many great paintings, architecture and in nature. The ratio is created by making a rectangle with a width of 1 and a height 1.168…. and then from that rectangle you create a perfect 1 by 1 square. You can keep doing this process indefinitely within a piece.
The Fibonacci sequence works with the golden ratio. The sequence creates a spiral within the ratio that can be used to pinpoint places of focus. The spiral is from a property of growth called self-similarity or scaling, which is the tendency to grow in size while maintaining the same shape. This idea can not only be applied to art but to nature as well.