While there may be fifteen bajillion different words that mean "a shade of red" there is actually no point where you can definitively state red becomes orange.
Does that invalidate the definition of red?
Excellent point.
To which I respond that the definition of red is not invalidated, but just as in gaming, at best, the definition of red is vague at the edges.*
But if you're talking about the soul or definition of red- or D&D- you're not talking about the periphery, you are talking about it's core. IOW, not where there is a blurring or overlap, but rather where the distinction is clear.
After all, one could say that my soul is similar to that of my father's or mother's- or even some if my friends'- but what makes it my soul is different from all of those. Or anyone else's. And that isn't at the edges of my being, but my very center.
* This is all assuming, of course, that science hasn't specified to the wavelength what constitutes red and each and every other color out there.
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