What does it matter? You're asking a non-question. Red-ness or music-ness are collections of similar and associated sensations (or inputs) to which you've applied a text-based label (or output). It's what brains (and other massively inter-connected networks) do.
Likewise, souls, gods and various other intangibles would appear to be labels initially applied to other collections of sensations but which, once labelled, seem to take on a life of their own. Possibly due to the runaway feedback effect that occurs often when the output side of a process is fed back as the input.
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