November 23 is Fibonacci Day, a holiday in honor of one of the mathematicians of the Middle Ages – Leonardo Bonacci. Why this day? Because when we write the date in the format mm/dd (11/23), the digits in the date form the Fibonacci sequence: 1,1,2,3. The Fibonacci sequence is a sequence of numbers in which the number is the sum of the two numbers preceding it. For example, 1, 1, 2, 3… is the Fibonacci sequence. The number 2 is the sum of the two numbers preceding it (1+1). Similarly, 3 is the sum of the two numbers preceding it (1+2).
The Fibonacci spiral, on the other hand, is made of quarters of circles whose radii are successive Fibonacci numbers.
We use the Fibonacci spiral when building the composition of the photo, because our brain reads such a composition as pleasing to the eye, so it is easier for us to attract the viewer’s eye and direct it to the place we choose.
