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

Doodling in Math: Spirals, Fibonacci, and Being a Plant of Vi Hart talks about Fibonacci Numbers

Spiral Fantasy ___ by Alfred Laing ___ Fractals are so purty! Here are the winners of the 2007 Second International Benoit Mandelbrot Fractal Art Contest, which was named after the Father of Fractal Geometry himself

History of the Fibonacci number sequence, their is clear evidence that ancient civilizations understood and used these numbers much better than we do today.

Coneflower, Golden Ratio, more fractal geometry in nature