The picture below has 2 identical dolphins in 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 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.