So you want to know about this glass? You want to know if it's half empty, or half full? Well. Let's start with the glass itself, shall we?
This glass, like everything else, is made of atoms. It's a given. Now your atom, when you look at it very closely, is hardly there at all. The space between its constituent parts, compared to the size of the parts themselves, is vast. A void. It's mainly empty space.
So what does it matter how much liquid the glass contains? The glass itself is mostly empty space. Your question, earnest though it is, is meaningless. When you look at this glass... you look at nothingness.
Just one of four carefully crafted answers to that eternal question: Is the glass half empty, or is it half full?
Originally a T-shirt design for The Retropolis Transit Authority ( [link]