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We’ve begun to address the concept of an image in the mind.  Vision involves the conversion of light into nerve pulses on the retina, which broadcast a perceived image of the outside world to our conscious and unconscious Mind.  This creates a multi-dimensional representation of the world, which we interpret as our reality, the physical world we are apart of.  While the pathway of light progressing into a representation of our reality leaves much to be questioned about how our interpretation of the world compares to objective reality, I think it is also important to just consider vision’s roll in grounding ourselves in a physical world that constitutes our reality.  The other senses certainly play an important roll as well, but it seems that vision is the sense we value most for its roll in illuminating knowledge of our reality.  (You might have a personal preference for hearing, perhaps you’re a musician, or taste, but seeing is almost synonymous with Knowledge -- God sees all, Big Brother is watching you, the all-seeing eye on the Masonic seal of America. etc.)  So what happens to our reality in the dark?  If there is no light to be translated into an internal model of reality, what does our reality become?  If you sat 40 feet down in the ground, at the bottom of a well, with no light penetrating deep enough to reach your eye, what happens to your perception of your body and the physical world? (á la The Wind-Up Bird Chronicle) Certainly this is a question that has been considered before, and I think it would be interesting to investigate some previous insights into the importance of light for the creation of reality.