Spiral-logarithmic The Fibonacci sequence is defined by a recurrence relation, where each term is the sum of the two previous ones, beginning with terms 1, 1. That is, it has the following form:
1,1,2,3,5,8,13,21,34,55,89,144,233,377,610 … Extending to infinity. It was named “Sequence of Fibonnaci” after the Italian mathematician Leonardo Fibonacci discovered this sequence in the pattern of plant growth. This sequence transferred to flat geometry was known as the “Golden Ratio” represented by the number PHI – 1.6180339 consisting of numbers occurring in the same order, forming a spiral that can be found widely in various natural, mineral and artistic world configurations.
From ancient times, golden proportion is used in art. It is often used in renaissance paintings, such as those of master Giotto. This number is involved with the nature of growth. Phi (not to be confused with Pi number), as it is called “The Gold Number”, the “gold number”, can be found approximately in man (the size of the phalanges, bones of the fingers, for example), In the hives, among numerous other examples involving the order of growth in nature. Precisely because it is found in studies and research in Architecture and Geometry, the Phi number has gained an status of “ideal”, being the target of researchers, artists and writers. The fact of being supported by mathematics is what makes it fascinating.