I think mentally ill people do see what others don't, sort of by definition. Question is if they see what really exists. The article says something else, howev

I think mentally ill people do see what others don't, sort of by definition. Question is if they see what really exists. The article says something else, however. It first states that people with depression (and not "mentally ill people") apparently see the world more realistically, based on modern scientific research, which is indeed mentioned. Then it briefly extrapolates it to mental illnesses in general, this time based on Aristotle, which by modern standards is more fiction than science. Then it talks again, at length, about examples of successful leaders with depression. The whole text is explained to be an excerpt from a book. Perhaps the title of the post (which is the subtitle of the article) would fit it better? Cannot be sure without having read the book.