Notice that the two opposing sides have the same shape; they are the opposites of one another only in the attributes color and orientation. In other words, one side is the negation and inversion of the other side. But this cannot be done with just any shape; not every shape can be inverted and then added to itself to form a perfect circle which represents unity.
Golden Ratio is a number in mathematics; it has the numerical value of 1.61803398875…. When the ratio of two quantities is this number we say that they are in golden ratio. This number has huge significance in mathematics because it is the corner stone of spiral geometry which is observed everywhere in nature. It is also the limit of the Fibonacci Sequence. In fact when the ratio of two lengths is the golden ratio they have an inherent tendency to make up harmonious and beautiful structures.