I say the glass remains full at all times. The half that is not occupied by water (or whatever) is full of air.
But, if there was an answer to this question you're getting at, smarter minds than ours would have hit upon it ages ago. I never liked equating the half glass to optimism and pessimism anyway, or partly cloudy/partly sunny for that matter. I don't see what it has to do with it.
I don't, but let's say I DID have a negative outlook on life. Why do I have to say half empty? What if the glass IS empty and I slowly start to fill it with water from a pitcher. At the halfway point, why would my pessimistic self have to call it half empty? It's less empty than it was when I started to fill it. Or should I say "un-empty it"? When the water reaches the top, instead of saying the glass is full, do I have to say it's un-empty? Or at that point, would I sigh and say, "Yeah but now the pitcher's half full?" The reverse is true for the optimist who then comes along and drinks the water. After the halfway point, is it "half un-full"? No, he's beginning to empty the glass, pure and simple, no matter what his state of mind is.
It's a silly argument.
-Mikey
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