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Eh, I lie somewhere between optimist and realist. I'm a bit too optimistic to be a realist, but I'm not overly willfull. No pessimism for me though. It doesn't get you anywhere. I find it annoying.
Alright, I'll answer the glass thing. The glass has water in it. It's half a glass of water. If I'm drinking it, it's half empty because I will continue to empty it. If I'm filling it, it's half full. This explains it all.
...That's it really, on that anyway. I write something important later. Ta