There are studies and findings that do correlate the two.
Bringing it down to their simplest definitions is quite easy and has a certain lack of creativity and intelligence in itself.
Finding and understanding how the correlation works is evidence of a level of creativity and a sign of intelligence.
Genius can also be simply put as above average common sense.
Creativity can be simply seen as artistic.
Madness is simply wherever the social constructs of society wants to set the bar at. This varies and is dependent on the society itself that sets that bar.
Simply Googling the words madness, creativity and genius will bring you many hours of reading.
None of which will change an individual's level of madness, creativity or genius.
But it may change your level of intelligence.
It is also something that if you live in it, it is quite simple to understand.
But is is for that reason, living in it, that it is hard to explain in a simplistic form, if you haven't been there.
As simply living really isn't living at all, it's quite a complicated affair in a world that strives to be sane, yet creative simultaneously.
Along with expectations of a certain level of intelligence that is deemed to be appropriate in whatever society you happen to live in.
I know some very creative people who I wouldn't call genius' and vice versa.
But I know and worked with some of the most highly intelligent crazies this side of the Psyche Units.
The very term, 'thinking outside the box' implies going beyond the norms of both.
It is from a vantage point outside of the so called normal, that one truly becomes a creative genius with one foot in madness, simply by virtue of being there. And vice versa.
Although one is not dependent on the other, it helps.
Ativan