If you want to keep an open mind and see the big picture, it’s probably best if you’re just in a pleasant (or even sad) mood.
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research conducted by psychologist Eddie Harmon-Jones and his colleagues suggests that the critical variable influencing one’s scope of attention is not emotional valence (positive vs. negative emotions) but motivational intensity, or how strongly you feel compelled to either approach or avoid something.
When I was in my late twenties, a friend suggested that, since I was an avid SF reader and had been since I was barely a teenager, that since it didn't look like the poetry was going where I wanted, I might try writing a science fiction story. I did, and the first story I ever wrote was 'The Great American Economy.'
I enjoy worldbuilding very much. I generally start with an approximation. With 'Flesh and Spirit' and 'Breath and Bone,' because I was thinking of a world on the brink of a dark age, I began with the sense of Roman Britain. But I purposely set the geography to match something other than Britain - which has been overdone.