The old phrase of whether a glass of water is half empty or half full is very interesting as people must make a decision, there is no middle ground, no sitting on the fence. The glass of water is a metaphor for how people say life and whether they have chosen to see be always be pessimistic or always be optimistic. I have chosen the later and people always remark on how I see the positive in everything however different the situation is.
We decide how we see the world and who are half empty sort of people should understand how that affects how they see the world and how indeed other people may relate to them. We can create our own luck and we can create our own difficulties by our own attitudes towards life.