A really interesting thread. Thanks for the link hildajenni, I am a 'protagonist'. I enjoyed the quiz and it linked in very definitely with a Myers Briggs test result I got some 25 years ago ... some things do not change!!
I think we are born with an inbuilt way of reading / processing and experiencing the world around us. But a lot of what we discern as 'positive' or 'negative' is very subjective.
Is it pessimistic to see the potential negatives in a situation? Some might say that is a good, realistic trait than can protect us from harm / disillusionment. Is it idealistic to look for the best in others, to maintain hope in the face of apparent adversity? That might also be a useful trait and uphold mental health. Two very simplified examples, but hopefully that makes sense.
I can reflect on my 4 children and identify two as being more 'cup half full' and two as 'cup half empty' people.
I think this is nature far more than nurture at work.
I often think of how my mother, who had a very hard childhood and difficult adult life, was able to be satisfied and take great pleasure from the simple things: feeding the garden birds, the first daffodils of the season, the freshness after a thunderstorm. Such things fed her imagination, made her feel renewed and inspired her love of the world. She was often happy despite lack of wealth and what the world would see as the trappings of success. I take a lot of heart from that.