I just saw an interesting program on Discovery channel. This guy found that almost everything in the average supermodel body is done on the aforementioned ratio. i.e.:
Front incisor length : length of that other tooth next to it.
Length of first bone in finger : length of second bone in finger
Width of mouth : Width of nose
NOTE: the above ratios are actually backwards.
Anyway - so beacuse your noce makes several triangles, they made an isosceles trinagle with a ratio on the sides of 1 : 1.618.
If you bisect the legs and extend them to 180(5-1)(5) degree angles, it makes a regular pentagon. It's matches exactly with lines drawn from the tip of the nose, to the cheek bones, to each side of the chin when they'
re smiling. Cool huh?