I don’t think there is any “senseless bickering” in this thread.
I am also pretty sure the problematic word isn’t “color” but “existence”.
There are words that have no reference to something that has been experienced in the past. We simply call them meaningless words. Some philosophers use technical terms such as “empty signifiers” to refer to them.
These are not merely words that refer to something imaginary. No, these are words that have no reference point whatsoever.
I have no idea what you mean when you say “undefined” but one possibility is precisely this, I mean, “having no reference point in experience”.
Usually, such words are formed when something we expect to be there turns out not to be there.
Sort of like expecting to see a circle only to end up seeing a square. Unable to admit that there is no square, one settles for something meaningless such as “square circle”. It’s not exactly a circle but it’s not something other than the circle either!
There are questions that have no answers. We like to believe otherwise.
Mathematicians ask “how many [straight line] units are there in the circumference of a circle with a diameter that is d [straight line] units long?”
There is no answer to this question because such a relation does not exist. You cannot construct a boundary of a circle using straight lines.
There is no C = d * Pi where Pi is at least a decimal or a rational number (none of which are numbers.)
There is no exact equality between C and d * x, only approximate equality.
There is no Pi. Noone ever saw Pi. We imagined that it exists because we needed it to exist. But it does not.
Instead, what there is is a set of decimal numbers, or more precisely, an algorithm for calculating the multiplier based on some desired degree of precision.
Now, I want you to compare the concept “Pi” to the concept “color qualia” and look me in the eye and tell me that the latter is undefined when it’s pretty fucking clear that most of us have an experience of it.
But who knows what you’re speaking of when you say “undefined”. Perhaps you don’t know what colors are qualitatively? I can’t tell.
The problem that troubles the concept “Pi” does not trouble the concept “color qualia” but it does trouble the concept “existence”.
Many say existence is mind-independent. Which is a ridiculous claim, if you think about it.
How can we know anything that is mind-independent?
Is that some sort of “out-of-body(or should I say mind?) experience”?
Seriously?
And if I deny mind-independence I am automatically a subjectivist who thinks that anything goes?