The Soulful Atom

We all know the famous anecdote about the pessimist and the optimist talking about how the glass if half empty or half full. I was wondering about that and a thought came to my mind. When a pessimist says that the glass is half empty, he obviously does see the water (or whatever else you want) in it and then he sees the empty space, so it could be possible that he sees an opportunity for the glass to be filled further. In thinking this maybe he is being hopeful or more optimist about new opportunities and possibilities for being better. Whereas the so called optimist just sees what is there and then stops at it. Taking this perspective perhaps its good to appreciate what you already have (like the optimist does) but isn't it better to look for what more can be done? And how you can improve even further with a hope and belief that it indeed is possible since the glass is half empty! :) Something to think about?