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You may have heard of synesthesia before. To see sounds, taste colors, and so on is a thing that most of us can only fantastically imagine about. What if I told you that if you're reading this now, you too probably experience synesthesia every day!
In fact, communication through language is only possible thanks to complex chains of synesthetic connections in the brain. In order to make sense out of the words you're reading now, your brain is hard at work (outside of your awareness, typically!) to associate them to multi-sensory experiences. You may "hear" an internalized representation of your voice as you read, or if you know the sound of mine you may hear that. Without associating the visual image of a word to some other sense experience, it would not be possible to make meaning out of what you read. Expressive authors take advantage of this in order to evoke representations of vibrant color, sound, and feeling in your mind.
In some fields this process is referred to as trans-derivational search. Which is if nothing else a jargon-y way of saying that to make meaning the mind must turn it's point of awareness inward or "go inside" to look for something to associate. Inner representations of knowledge and experience from our past that our consciousness synthesizes into an association about the meaning of our experience in the present. Staying only on the outside, we can make little meaning of our ongoing experience. At the least, the meanings made will be of a much reduced subtlety and texture- hot/cold, comfort/discomfort, light/dark, and so on...