I do believe I've got it! favicon.ico is the image that gets displayed in the title bar of the browser (for browsers which support this capability, which is most of them) when a reader is looking at your web page. (Also it is used by things like rss readers as a visual way of identifying your site.) For a long time I have wanted to have a butterfly icon to go with the butterflies that are my background image and the butterfly at the top of the page*. Sort of an homage to Nabokov and to García Márquez; plus I just like the little things. For a long time I was using a shrunken-down version of the big butterfly; but at 16×16 pixels it did not (as Sylvia did not tire of pointing out) look particularly like a butterfly (); then I tried shrinking the butterfly image which is in the sidebar of Zembla; but again, it is too detailed to make a good icon (). I looked at some favicon library sites the other day and found a couple of nice butterflies but nothing that was exactly right for readin. But finally I found this butterfly, at the site of the (lamentably out of business) Brooklyn housewares store Nova Zembla:
Excellent! I shrank it down, added a little color, it seems just right to me:**
* If you are not seeing a butterfly at the top of the page, it is because I made that only show up on Firefox, Chrome and Safari -- I couldn't get msie to display it the way I wanted it to, those were the only browsers I tested on.
** (If you are not seeing the new butterfly icon, that may be because your browser has cached one of the old ones. Browsers seem to store favicon's in their cache longer than a lot of other files...)