The picture has 2 identical dolphins in it. It was used in a case study on stress level at University Medical Center. Look at the two dolphins jumping out of the water. The dolphins are identical. A closely monitored, scientific study of a group of students revealed that, in spite of the fact that the dolphins are identical, a person under stress will perceive differences between the two dolphins. If there are many differences perceived between the two dolphins, it means that the person is experiencing a great amount of stress.
Look at the photograph and, if you find more than one or two differences, you may want to take a vacation.