Are you color-blind, Caledonian? Do you ever use color words? Do you think they refer to nothing more than "neurological associations"? Or is it that they do refer to something of which you are directly aware, but which you have a way of talking around?

When I look out the window right now, I see a blue patch of sky. Am I seeing neurological associations? Am I seeing a mathematical description of neurological associations?

You are free to deny that 'blueness is there', but if that is your only counterargument, I have to think my original argument must have been quite strong.