Pi and Phi?

What is the significance of Pi? Is there a relationship between Pi and Phi? Instinctively, I feel like there is... Phi is nearly half of Pi and certainly part of the fractal geometry of the universe, but do they have a relationship to each other other than being a fundamental aspect of our reality? Or is Pi just Pi and that's it?

I ask based on fundamental laws and it's reference in crop circles and not to mention their recurrence in physics, mathematics and nature in general.

Thank you all.