Maybe this could explain why mental illness & creativity seem to be so closely related? Just as one example, James Joyce's daughter was schizophrenic.
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According to Wikipedia, creative people are 25% more likely to have a mental illness.
As for why so many bipolar people are famous, manic episodes can be very productive.
For myself, being bipolar has given me several lifetimes of perspective to inform my writing.
https://en.m.wikipedia.org/wiki/Creativity_and_mental_health
I suspect (with nothing to support it) that there is a range where people with mental illness are able to interpret the world differently than normies (and thus make connections that normies do not), but also a point where that perception gets so out of joint that they can no longer function in reality. So in the former case, it may help in creative pursuits, but the latter may hamper it.