Fibonacci an 15th century Italian mathematician who discovered this spiral.
For those of you who are not mathematically illiterate like myself, above the spiral and the maths formula that goes with it.
In the left of the picture is a diagram of how it looks and a close up photo of a flower where you can see the spirals clearly, 34 to the right and 21 to the left.
Fibonacci spiral in a hurricane moving over what looks to me like Florida below.
In a spiral galaxy.
In a snail's shell. Look closely at things, another of millions of examples, is a pine cone.
Photos and diagrams from Wikipedia.