Sunflower
digital image, size variable 2020 W70007
permission
via en.wikipedia.org/wiki/File:SunflowerModel.svg
A
model for the pattern of florets in the head of a sunflower was proposed by Helmut
Vogel in 1979. It is a form of Fermat’s spiral; the angle 137.5 degrees relates
to the golden ratio and gives a close packing of florets.
