The glass is neither half full nor half empty; it is merely too big for the water it holds, and thus reflects an inefficient utilization of resources deployed to contain the given water. An analyst is neither optimistic nor pessimistic.
Probably. Since the glass is always full of some sort of fluid, unless I had mentioned specifically that it was situated in a vacuum. As a metaphor, the air or whatever fluid that isn't water can be considered unnecessary or immaterial.
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