Stress Indicator

A friend sent me this picture on Facebook recently, along with the following text "I've attached a picture you can use in your medical practice. It's a stress indicator and is a pic of two dolphins. If the patient can see the two dolphins, then his stress level is acceptable and there's no problem. However, if he sees anything other than two dolphins, he is severely overstressed and requires treatment. Try it yourself. I think there's an Indian version using two elephants."

After I had examined the picture for a moment in some confusion, I sent him a return message asking "what does it mean if you can see two cows?"