GLASS half full or half empty… Dose’nt it depend on the size of the GLASS?

We all know about half full and half empty, its about optimistic and pasimistic.
But I say it depends on the size of the Glass, and for me even a drop of water makes a glass full and even whole water of the world will keep a glass empty.
An empty glass is ZERO and a single drop of water makes it towards positive like 1 drop 2 drop.. Do we have the last digit to it?
The whole idea of my question is EXPECTATIONS, the size of expectations makes an individual happy or sad, rich or poor, satisfied or unsatisfied.
And only this charecteristic of us we HUMAN will take us to NEW WORLDS, but on the other hand will make more and more people feel inferior, less, incomplete, unsatisfied.
ANY MORE IDEAS AND COMMENTS ON THIS?