Like every other thing in life, it's all a matter of mindset, it all depends on what you think it is. So if you say the glass is half empty, you are right, it just shows that you are a pessimist, and you only see the negative sides of things, and if you should say the glass is half full, then rhat makes you an optimist. Half full or half empty all depends on how you view things in life in general. So if you are a pessimist, you will see a half full glass and you will be seeing a half empty glass if you are an optimist. But for me, what I see is a half full glass.