Here's a picture that's been doing the email rounds (for some time, I think). The question is, is it a photograph or a painting? Well, if you look closely you can see that the areas on the side are sketched in and not that detailed. So it's a painting. If you tilt your head to the left you can see the shape of a woman standing behind a child. But Mary Alice, who sent me the picture, says that if you tilt your head to the right you can also see a big bird's head pecking on an acorn (though she admits you might have to be a birder to see it right off the bat).
Commenting is no longer available in this channel entry.