That's like the thing about your thumb and your nose. About the same size.
And all about the number Phi! Something like 1.61.... etc. It's called the Golden Ratio as everything in nature is based on it. I can't remember where from where to measure to on your body, but every time you divide the larger number by the smaller number you get the Golden Ratio... Can any one help me out here?

Or am I just getting confuddled... again.