I wasn't looking for a mathematical proof. They're scattered all over the web!

Thanks for the help, Hoo Ling Chee, but my question "why?" was directed at why everything from snails to sunflowers to even the galaxy shown above ... and yeh, even to the lengths and widths of credit cards are bursting with the limit to larger and larger ratios of consecutive Fibonacci Numbers (the limit happens to be the Golden Ratio (proof at this site) and a number-theoretic proof is really only a lame answer to a lazy mathematician's "why?" Does God alone know why it's scattered "naturally" throughout the universe--from sub-atomic particles to clusters of galaxies?

So again, I ask ...

Why?