I have to continue my analysis of "Inception", because of what I left out. The "anti-realist" view of "Inception" is a "thought experiment". Ideas breed thoughts that "bloom" in the mind. And my mind "blooms" many thoughts :)!
The main character's father had been the initiator of the "anti-realist" position to his son. But, he had found that his son had become "stuck" over the guilt and responsibility of his wife's mental instability and resulting suicide. The father pleaded for his son to leave "this world", a created one, and come to the "real world" where sanity could be restored. When the effort failed, the father introduced his son to a bright and promising student. This student was to continue the "tradition" of "creating worlds"....
The student soon became aware that there was a hinderance on the part of her mentor. The teacher was stuck and she sought to find out what had hindered him in his ability to "enter" the world of the other without interference of his own "baggage". The student's own journey could not be continued without letting the teacher go, as he had to work through his own issues. The impact on the real world of "his creation" could not be recognized or acknowledged, as he became obessessed with getting back to his children and the real world that they lived in. His fear of separation from them had led him to his bondage and he punished himself by creating the prison of his own mind.
This is the real world of "self punitive" behavior when one has not forgiven oneself for past indiscretions. Acknowledgment of one's limitations and failures is part of maturing and coming to terms with reality, which is what the "old man" represented in the end.
Humans have a great capacity to deny their "real worlds" for the "worlds" they create and inhabit. These "worlds" are walls of prisions that won't surrender their victims until the victim takes the responsibility without demanding perfection of himself. The "ideal" hinders growth, liberty and an ability to embrace life with its complexity, joys, sorrows, fears, hopes and dreams. These realities are what life is made of and for. Without entering life, there is no hope for entering another's life, not really, because life will always be about accomplishment, success, or perfection which hinders the ability to see, understand and grasp the real world of another life.