The Half Glass Half Empty Concept

I was at work recently and one of my supervisors had a drawing on his wall. It was a picture of a glass of water. In the illustration he noted that he wanted to be where the water was; the half full place. He also noted that he didn't want to be where the empty part was. I thought to myself that is interesting because he needed a visual to confirm an idea in his mind continually to be positive and not negative. I have to admit it was brilliant. However, eventually that message has to be in your heart ultimately. Perhaps this picture was his way of getting to that point. Its a catalyst for change. I am not mad at it.