I know that no object has a definite color that exist outside of the brains interpretation of the light being reflected off if an object. So if I say the ball is red what I am actually saying is in my mind I visualize the ball as red. That being said color must be a subjective experience and that color assignment is a mental activity? I would follow up to ask is it possible that different brains assign different colors to the same object? The real simple question would have been how do all humans see the same objects having the same colors? TIA ELI5
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There are some misleading answers, ignoring the actual question here, which is about subjective perception and [qualia](https://en.wikipedia.org/wiki/Qualia)
The objective physical response to light wavelengths, in the molecules in our eyes’ cone cells, has zero predictive or explanatory utility, on the issue of our subjective perception of “redness”.
It’s not known how qualia arise from the brain’s collective neuron activity. (We do know that certain brain damage will prevent perception of sight, even with no damage to the eyes.)
So there’s no way for a person to compare their perception of “redness” with anyone else’s perception. Again, that’s covered in a discussion of *qualia*.
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