Fi, Perfect order, perfect harmony… Also known as the golden ratio; It is a special ratio of most uses designed for use, to be used for its perfection in art and architecture, in many forms or in many inanimate structures found in nature or from facility to facility. It is possible to find Fi in everything we call beautiful and seen as aesthetic. Also, this special ratio is a number discovered by the ancient Egyptians and Greeks. It has since been known as Fi (phi number). It is possible to see this number, which is equal to 1.618 mathematically, very differently in nature. At the same time, this number is similar to the fact that in nature not only more models can be matched, but remain in balance from the same problem.