Google Reader's favicon flag

A little experimentation revealed how to change the icon. When I have no new items to read, the favicon is the usual level one. But if I have new items to read, then the favicon is tilted up, like a mailbox flag when there's outgoing mail in the box.
Could this be what the Google Reader team intended? It doesn't seem likely, because the tilted version is actually a 3D perspective version. But still, that's what my experience has been so far. It's a little mailbox flag for new articles!
I know what you're all thinking: Ooh, fascinating, David! Is this what you do in your spare time?
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