Glass Theory*

This is something that I argued during our Individual Dynamics (Organisation Behaviour) class.

We have been convincingly told that the person who thinks that the half filled is "Half Full" is an optimist and the one who thinks it is half empty is pessimist.
The argument against it is that the person who sees glass half full and gets happy is actually expecting the glass to be empty and hence happy that the glass is at least half full. On the other hand the person who sees the glass half empty is actually expecting the glass to be completely filled. He would then like to fill the rest of the glass. Hence, contrary to the popular opinion, the person who sees glass half empty is an optimist and the person who sees glass half full is a pessimist.
____________________________
* The name has been suggested by Piyush "Bhai" Chaurasiya.