I one listens to Leo...aprox:(1:09:00 thru 1:11:25),,this is how or is very similar to the message that the "Allegory of the Cave" is trying to convey.
Allegory of the Cave. Left (From top to bottom): Sun; Natural things; Shadows of natural things; Fire; Artificial objects; Shadows of artificial objects; Allegory level.
Right (From top to bottom): "Good" idea, Ideas, Mathematical objects, Light, Creatures and Objects, Image, Analogy of the Sun, and the Analogy of the Divided Line
Plato then supposes that one prisoner is freed. This prisoner would look around and see the fire. The light would hurt his eyes and make it difficult for him to see the objects casting the shadows. If he were told that what he is seeing is real instead of the other version of reality he sees on the wall, he would not believe it. In his pain, Plato continues, the freed prisoner would turn away and run back to what he is accustomed to (that is, the shadows of the carried objects). He writes "... it would hurt his eyes, and he would escape by turning away to the things which he was able to look at, and these he would believe to be clearer than what was being shown to him."
Plato continues: "Suppose... that someone should drag him... by force, up the rough ascent, the steep way up, and never stop until he could drag him out into the light of the sun." The prisoner would be angry and in pain, and this would only worsen when the radiant light of the sun overwhelms his eyes and blinds him.
"Slowly, his eyes adjust to the light of the sun. First he can only see shadows. Gradually he can see the reflections of people and things in water and then later see the people and things themselves. Eventually, he is able to look at the stars and moon at night until finally he can look upon the sun itself (516a)." Only after he can look straight at the sun "is he able to reason about it" and what it is (516b). (See also Plato's Analogy of the Sun, which occurs near the end of The Republic, Book VI.)[4
Return to the cave
Plato continues, saying that the freed prisoner would think that the world outside the cave was superior to the world he experienced in the cave; "he would bless himself for the change, and pity [the other prisoners]" and would want to bring his fellow cave dwellers out of the cave and into the sunlight (516c).
The returning prisoner, whose eyes have become accustomed to the sunlight, would be blind when he re-enters the cave, just as he was when he was first exposed to the sun (516e). The prisoners, according to Plato, would infer from the returning man's blindness that the journey out of the cave had harmed him and that they should not undertake a similar journey. Socrates concludes that the prisoners, if they were able, would therefore reach out and kill anyone who attempted to drag them out of the cave
This also conveys my Idea of "Pre-Concieved Notions"
Leo talks of Post-Rationalism...here is a paper I fine very interesting..Narrative in "PostRationalist Cognitive Therapy " (on site pdf file)
Wading River, Long Island. 1921. "Behold! human beings living in a sort of underground den, which has a mouth open towards the light and reaching all across the den; they have been here from their childhood, and have their legs and necks chained so that they cannot move, and can only see before them; for the chains are arranged in such a manner as to prevent them from turning round their heads. At a distance above and behind them the light of a fire is blazing, and between the fire and the prisoners there is a raised way; and you will see, if you look, a low wall built along the way, like the screen which marionette players have before them, over which they show the puppets. I see, he said. And do you see, I said, men passing along the wall carrying vessels, which appear over the wall; also figures of men and animals, made of wood and stone and various materials; and some of the prisoners, as you would expect, are talking, and some of them are silent? This is a strange image, he said, and they are strange prisoners. Like ourselves, I replied; and they see only their own shadows, or the shadows of one another, which the fire throws on the opposite wall of the cave? True, he said: how could they see anything but the shadows if they were never allowed to move their heads? And of the objects which are being carried in like manner they would see only the shadows? Yes, he said. And if they were able to talk with one another, would they not suppose that they were naming what was actually before them?"—The Republic of Plato, Book Seven. (Jowett Translation.)