The attached photo has 2 almost identical dolphins in it. It was used in a case study on stress levels with patients at St. Mary's Hospital.
Look at both dolphins jumping out of the water. The dolphins are identical. A closely monitored, scientific study revealed that in spite of the fact that the dolphins are identical, a person under stress will find differences in the two dolphins. If there are many differences found between the dolphins, it means that the person is experiencing a
significant amount of stress. Look at the photograph. If you find more than one or two differences you may want to take a vacation.
Yak Chat & Vanderlay bought out this very intersting theory in another post, I thought it deserved it's own right....
http://i235.photobucket.com/albums/ee243/arkraider_album/220Dolphins.jpg