Composing with Fibonacci

Actually, the rule of thirds is a rip-off of the Fibonacci ratio (in my opinion), also known as the 'Divine Ratio' and the 'Golden Mean'.  The rule of thirds simply made it easy to establish the common 8X10 format and an estimation of subject placement.  The Fibonacci rule defines not only the location of the subject, but in its strictest sense, also defines the size/dimensions of the image.  The size of the image must meet the 1:1.618 ratio in order for the rectangles and the spiral to work out properly.  Very fun to think about though.