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The glass is 50% empty or full, but it is entirely made of glass so it is also 100% glass.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
It's also 50% air so therefore 100% full.
Either way there's too much glass or not enough water.