The picture has 2 identical dolphins in it and was used in a case study on stress levels at St. Mary's Hospital, London.
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 would find differences in the two dolphins.
The more differences a person finds between the dolphins, the more stress that person is experiencing.
Look at the photograph and if you find more than one or two differences you may need a holiday or medication ... or possibly both.
Spoiler:
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