Phi and the golden rectangle

You may recall back in December when Ian sent me a photo of his Fibonacci Gauge. I was completely intrigued by the whole concept of Phi, the golden ratio. It only took me three months to finally get around to making one of my own.
I have learned that this ratio is everywhere! Logos, for example:

Its really quite amazing and can come in very useful when designing woodworking projects. If you would like to make one, Mark Whitsitt designed one  you can download, with all the correct dimensions. Heres a PDF version and a Sketchup version.

Thanks Mark and Ian!