I'm not cool or anything, but this has been popping up everywhere. Best current conjecture is that it's a nonverbal zing - two-faced Bush. I second that emotion. It might, however, have been a bit more evocative if the face were turned, showing more of the good side than the bad - but showing enough bad that you'd have to be an idiot to not see it. Get it? And to finish off the symbolism, I suppose the good side ought to be made transluscent - indicating the pure superficiality of Bush's good side.