Worlds of the outsiders and the insiders.

 The mind nurtured outside itself grows toward society, while the mind nurtured within itself grows parallel to society. This determines whether a person will walk their own unique path or follow the same path as their era and civilization. They either embrace the herd, break away from it after joining, or never belong to it at all. This shapes the root of their personality, making them either normal or post-norm. From this point onward, they belong to utterly different worlds that are mutually exclusive—like a bear in the forest and a fish in the sea.