Since the time of the greeks the golden ratio is known, at first it was mentioned

in the 13 books of Euclid´s Elements several hundert years before ours calendar,

after that it was also known in the Middle Ages from Leonardo of Pisa (Fibonacci).

Fibonacci numbers are an number sequence which always add the last 2 numbers

together and so on, when it climbed higher it´s getting closer to the great Phi or

to an irrationally numerical value the golden ratio.

The most artists take care of this proportion, which gave a better

view to the pieces of art then a centered or even misplaced style.