phi in nature
"You can find in nature, e.g. in sunflowers and shells."
Disclaimer:
This isn't true. In the theory on spirals math offers a better alternative than 'approximately' .
sunflowers
The position of sunflowerseeds is fascinating. You see sprials in two directions and more, the number is far from random.
You can experiment in applets and learn more on the page spirals and sunflowers.

Nautilus pompilius
The Nautilus pomplius is an octopus with a shell. This shell often appears in pictures and publications to illustrate the appearance of in nature.
But in this too some mathamatical background reveal that the claim is false
Read more about it in the chapter spirals and shells.
