Re: Where does Pi appear in nature?

Since Pi is the ratio of a circle's circumference to its diameter, we can expect to find the number anywhere in nature circular designs appear. A circle is not a REALLY common form, but segments of the curve will appear in the forms of an ellipse, parabola or other conic section. One can also see the ratio in spirals (seashells, e.g.).

This may not be the explanation you want, but you could try a search on the net under Pi. You may be surprized in all the areas it pops up.