here is my question: the general idea is, if someone sees it as half full, he is optimist and if someone sees it as half empty he is pessimist. but there could be more ways to think of it. given that techincally both are true.
someone who is lazy sees it as half full and will not fill it up completely. that means if he needs more than the water in the glass he is in trouble.
on the other hand, energitic people will see it as half empty and will fill it up all the way. result, a secure meal.
think about it, there could be several more ways to explain this.
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