Merely living in different environments can produce men with such different experiences that, if they try, they will realize that it is not possible to establish mutual communication. None of them will be able to correctly grasp the meaning of what the other says, and will end up judging it as inappropriate before suspecting that the problem may lie in their own understanding. Reality, identical for all, has aspects revealed only to some. And if, not of free will, but out of some unforeseen and uncontrollable necessity that prevents deviation and demands confrontation, some of those aspects end up being revealed, the man who has to confront them will know from experience that they are real, and his personality may be transformed forever; but even so, he may never be able to put into words and convince another man of what he has experienced.