Is the glass half empty or half full?Is the glass half empty or half full? is a common expression, generally used 
rhetorically to indicate that a particular situation could be a cause for 
optimism (half full) or 
pessimism (half empty), or as a general 
litmus test to simply determine an individual's 
worldview.
[1] The purpose of the question is to demonstrate that the situation may be 
seen in different ways depending on one's 
point of view and that there may be opportunity in the situation as well as trouble.
 This 
idiom  is used to explain how people perceive events and objects. Perception  is unique to every individual and is simply one's interpretation of  reality. The phrase "Is the glass half empty or half full" can be  referred to as a philosophical question.
[2]

 
			
		
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