Golden Mean or Fibonacci series. The number of clockwise and counterclockwise spirals in a sunflower are always two consecutive Fibonacci numbers.

An example of a Fibonacci sequence making spiral patterns in nature. This is also a fractal because each floret is an identical but smaller version of the whole thing & this makes the spirals easy to see.

science jewelry: Fibonacci necklace silver by

"Hokusai Meets Fibonacci Golden Ratio" by Ars Brevis This is an example of the golden ratio. The wave creates the curved effect which is pleasing to the eye. It has a rhythm to it, like you are counting up to the curve of the wave.