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It seems to me that there is a direct relationship between the picture in our head, and the bipartite nature of the nervous system. When we look at an image, we process some aspects of it consciously, and some aspects unconsciously. Often times this unconscious processing of an image appears in our dreams. I have often had the experience of being in a lecture and taking notes, and when I go to sleep, I end up dreaming about a particular object that was in the classroom, but that I had not given any focused attention to during the lecture. I think this supports the notion of a bipartite brain because the neocortex and the cognitive unconscious both have processed the same set of surroundings, but have chosen which aspects are relevant during a certain period of time. Perhaps these trivial objects show up in my dreams because I finally have time to think about them.