One element of Pluto’s cave is the human's need for knowledge and experience. Both of these go hand and hand to create the perspective of the person and it helps to shape who they are. The knowledge that the prisoners have is of shadow and they use language to give those shadows a definition of what things are. When the prisoners are free, they become able to understand how their perspective was limited and they have to rework their perspective of the world around.
Knowledge and experience are what build the perspective of a person. By understanding how your own experiences have shaped your understanding of this, it becomes possible to twist and form a new perspective. This is furthered by the access to knowledge and by seeing how having only a little bit of new knowledge in a subject can lead to an enlightened moment once you understand the limit of your perspective. The gray scale that was chosen to film in is a representation of the limit of knowledge for a person on a subject. It means that small framework of the knowledge will lead to limited understanding how you can perspective things. It also shows that even once new knowledge is gained, there may not be a total enlightenment too a full (color) understanding of the subject. There may just enough knowledge to be able to start to change our perspective.
The video is based on the prisoner’s framework of knowledge they gain from their experience in the cave. The prisoners only have the one view of the world which is what you see with the start of the video. As they understand their view, they start to search more knowledge to gain an even better understanding what they know, but they cannot get access to what they want. Then they have to break away from their limited framework and it is a chance to search for new knowledge. Once they have gone through an experience of understanding (the library) how small of framework they had, return to the place war memorial and are now able to full see what is. They have gained the ability twist their new perspective because of the enlightenment they have gone through.
