This illusion demonstrates how quickly the human brain organizes visual information. Once we decide that a particular shape is a mountain or part of the eagle, we naturally interpret it that way. That can make the hidden figure almost invisible.
If you manage to find the man, take another look at the image. You may notice that his outline suddenly becomes much easier to recognize. The picture never changed—only your perception did. That is what makes hidden-image puzzles so fascinating: sometimes, the hardest things to see are hiding in plain sight.
