[b]"You can find [/b][math]\varphi[/math][b] in nature, e.g. in sunflowers and shells."[br]Disclaimer:[br]This isn't true. In the theory on spirals math offers a better alternative than 'approximately' [/b][math]\varphi[/math][b].[/b]

The position of sunflowerseeds is fascinating. You see sprials in two directions and more, the number is far from random. [br]You can experiment in applets and learn more on the page [url=https://www.geogebra.org/m/cz8ggxgt#chapter/1133147]spirals and sunflowers[/url].

The Nautilus pomplius is an octopus with a shell. This shell often appears in pictures and publications to illustrate the appearance of [math]\varphi[/math] in nature.[br]But in this too some mathamatical background reveal that the claim is false[br]Read more about it in the chapter [url=https://www.geogebra.org/m/cz8ggxgt#chapter/1133148]spirals and shells[/url].