To play someone who is who they are because of the happiness and contentedness that they've known in their life is interesting because of sort of how banal it is.
Well there are two kinds of happiness grounded and ungrounded. Ungrounded happiness is cheesy and not based on reality. Grounded happiness is informed happiness based on the knowledge that the world sometimes sucks but even then you have to believe in yourself.
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It is now possible to quantify people's levels of happiness pretty accurately by asking them by observation and by measuring electrical activity in the brain in degrees from terrible pain to sublime joy.