But instead, all we find in a man's head is a soft greyish blob of wrinkled tissue seething with electrochemical activity.
It seems therefore that our subjective world of color and light must correspond to some kind of electrochemical activity in the physical brain. Only science can tell us about the true nature of those physical processes in the brain which correspond to the objective reality behind our subjective consciousness.
But wait! There is something very peculiar about this picture, and the whole formulation of the problem that it implies. For in this picture the world of color and light are depicted on the outside, while inside that grey mass of tissue are only electrochemical interactions, whose real nature remains to be discovered by science. The problem is that this picture is inside-out! For in fact the world of color and light is on the inside of our brain, not the outside!
Light, as it is known to science, is very very different from the kind of light familiar to our subjective experience. Subjective color is a three-dimensional experience, that can be expressed in the variables of hue, intensity, and saturation. Physical light on the other hand is essentially an infinite dimensional space. The three dimensions of color of our phenomenal world, and the space within which they are perceived, are properties of physical reality inside our head, not of the world outside of it.
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