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Is the glass half empty or half full is a common expression, used rhetorically, indicating that a particular situation could be a cause for optimism (half full) or pessimism (half empty).
It depends on how you look at it. The physicists will say that it is completely full - half water, and half air. A mathematician will take into account the meniscus, and a chemist would take into account the water purity and trace elements found. A logical thinker might argue that it depends on whether water was just taken out of the glass or placed in it. A philosopher would tell you the glass is empty. Or maybe there is no glass. An alternative answer states that the glass is actually twice the size it needs to be, and apparently indicates that the replier is an engineer. It all just depends on your point of view.