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I disagree with mo42 - the brain works by making associations, with everything. Red is not the same chemical mechanism, and the pathways that understand red are not essentially identical (sure they may be from the eye to the brain, but the mechanism for understanding red, or having a feeling about the sensation of seeing red are not).
Extreme example: You bring a child up on an abbatoir floor, and it is going to associate red with things dying and suffering, perhaps beggining to form associations linking redness to wetness, redness to twitching movements, redness to a certain set of smells, redness to slipping, mechanical noises etc.
Now bring up another child on a chille-pepper farm, he might associate redness with growth, ripeness, hotness, and an entirely different set of other associations.
The abbatoir child is going to have a very different sensation when he sees a red rose, than the chille-pepper child.
To address another point here, the brain is not *just* a chemical processor, it is a dynamicly changing system. Every time you see, feel, taste or otherwise experience something, the shape of your brain changes, new pathways are created, old ones cleared. You are nothing more than the *shape* of your brain. It would be impossible to move into someone elses brain because there's no you to move. You are the side-effect of the process that lives in your brain.
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