If we are in negativity mode we see the glass as half empty. Anyone can see it’s half empty. When we are feeling negative, we focus on what is missing and lament the lack of water in the glass.
When we are feeling more positive, we see the glass as half full. Of course it is half full. Anyone can see that. We focus on what we desire, and celebrate the presence of water.
Then there are those who see it as completely full – all the time.