When you click on the link at the bottom, it will open a webpage which has two identical dolphins on it. It was used in a case study on stress levels at St. Mary's Hospital.
Look at both dolphins jumping out of the water.
The closely monitored study revealed that although the dolphins are identical, a person under stress would find differences between them. It means that a person who finds many differences between the dolphins is experiencing a great amount of stress.
Click below and please examine the photograph carefully, and if you find more than one or two differences, you may want to take a vacation.
Click on the below image.