Posting at a snail’s pace

The Illustration Friday theme this week is “snail.”

I was going to write something about how we all carry “home” with us, for better or worse, or yet another version of “the race is not to the swift,” but hey, this is better:

A snail shell is an example of a logarithmic spiral, which means the overall shape stays the same even when the spiral increases.  (This unique mathematical property is called self-similarity, if you’re interested.)  Logarithmic spirals  are also called miraculous or marvelous spirals, and how lovely is *that*?  They occur throughout nature, and can be seen — according to a couple of online sources —  in the growth pattern of sunflower heads, in tropical cyclones, in mollusk shells, and in the arms of spiral galaxies.

These snails (which, by the way, are not logarithmic, or even drawn from reference) are watercolor and Verithin colored pencil on Canson Montval paper.