As you can see, it is pretty good, but I decided to keep looking for better circles in nature. The next thing I thought of were the circles that you find in the trunk of a tree, one for every year of growth. So I searched for pieces of wood and this is one that I found:

It is interesting to see the circles in the piece of wood. Some are pretty good, especially if you consider how they are formed. I decided to continue my search. The next thing that I thought of were beach shells Here is the most circular shell that I was able to find. What do you think of it?

I still wanted to find a better nature-made circle. I finally thought "outside the box" and came up with what I think is a better circle. Try to think what that might be and then click on the image below to check out what I came up with:

Acknowledgments -- I would like to thank Margaret Wertheim, the author of the very good and interesting book Pythagoras’ Trousers: God, Physics, and the Gender Wars for giving me the inspiration to write this lesson.

Lastly, special thanks go to Sherry Colarusso for her invaluable help with the final editing.