Actually, there something wrong with me. I see the pattern (baby looking down). If you read the link, you'll see the original color photo of this and see the baby clearly.
The exercise is to then look at this picture. Those who easily see the baby, are more likely subject to hallucinations as they try to always make sense of apparently random scenes, attempting to see patterns. It's useful in problem solving, but not so useful if there is no problem to solve. :-)