I used to love to untangle chains when I was a child. I had thin, busy fingers, and I never gave up. Perhaps there was a psychiatric component to my concentration but like much of my psychic damage, this worked to everyone's advantage.
I know it's really square but I'm one of those people who piles on the factor 50 as soon as I'm outside.
I have always been - I think any student of history almost inevitably is - a cheerful pessimist.