Pi

[Monoc]

Originally Posted by chardish

1:1.619 is the golden proportion, I thought.

It's better known as the golden ratio. As others said, it's common in nature as well as useful when doing recusive functions.

The golden ratio relationship of a rectangle is neat. If you have a rectangle with the golden ratio, than if you remove the largest square possible from your rectangle, the remaining shape will be a rectangle with the golden ratio.