Looking for a photo to inspire a painting, I ran across this one from a winter about two years ago. Can you instantly tell which tree is in front, or does it take a moment to think it through? The illusion comes from the white outline of snow – only on the right side of each trunk, but somehow it makes sense in my brain that both sides are outlined on the middle and right tree. I’m not sure now what struck me as not quite right first: the unnatural outline, or the necessity of one of those trees being in front of the other. Same thing, actually. Isn’t it amazing what we see when we really look?