In the great tradition of Mole Day and Pi Day, November 23 was Fibonacci Day. Why? Because the date 11/23 represents the first numbers in the sequence identified by Leonardo Fibonacci, and Italian mathematician who was born in Pisa in 1170.

The Fibonacci Sequence starts with 1 plus 1 equals 2, and goes on with each number being the sum of the two numbers directly before it: 1 plus 2 equals 3; 2 plus 3 equals 5; 3 plus 5 equals 8, and so on.

One of the beauties of the Fibonacci sequence is that the series is evident all over the natural world. Petal arrangements in flowers, the ordering of leaves in plants, the shell of the nautilus, the DNA molecule and even hurricanes show patterns that correspond to the sequence. From time & date holidays

It is a sequence that has significance in science, mathematics and art. In art, especially, construction of compositions based on the Fibonacci Sequence are recognized as aesthetically pleasing.

Also in tattoos: