The Fibonacci succession is an endlessly episode of numbers (the Fibonacci numbers). Each of the following numbers results out of the both previous numbers: 0, 1, 1, 2, 3, 5, 8, 13, …

The italian mathematician Leonardo from Pisa (called Fibonacci) published the succession in 1202 and can be seen in the construction of many plants.

Therefor the “Golden cut” finds always admiration, because it can be seen in nature like for example the **five- symmetrie **of bellflowers and starfishes. The shell of the nautilus includes in the construction the both of Fibonacci numbers and the golden cut.

The growth can be expressed by squares, which side lengths results of the sum from the next smallest square.