Moods are like a spectrum. On one side its negative and on the other its positive. But sometimes you just can't use strict structured things such as a mathematical spectrum to describe something so free and wild. There isn't enough adjectives similes or metaphors to describe these complex creatures. When language was created it was made to convey these moods but using language to convey mood is like using a thermometer to tell what time it is. It just doesn't make sense.