Intimate relationship. When a snail travels along the spiral of a Fibonacci series, the angle of rotation of the snail in the process of traveling along the shell is exactly the golden section angle, which is why the snail's shell is closely related to the golden section ratio of Fibonacci series. Fibonacci was an Italian mathematician in the Middle Ages. He was the first person to study Fibonacci numbers in the West and introduced the modern system of writing numbers and multipliers to Europe.