Fibonacci - Sacred Geometry

Belonging to a closed group of scribbler's; the weekly prompt was sacred geometry. So, I decided to try my hand at the Fibonacci nautilus. My attempt to do it by hand, with my engineering tools, was frustrating; trying to make perfect squares. So, I decided to use my Adobe Illustrator and do it with my computer. So here is the one I just finished. I want to try other solutions, but this is my first.

I also designed the letters, using geometric forms.