Interesting reasoning. And, yes, we do depend on linguistic dialectics to understand certain concepts. I’m not sure I agree w/ your analogies however. Darkness — the absence of light — is a real, not imagined state. Likewise, the blue sky is not an illusion. It does have to do with the scattering of light particles, but so too do all aspects of our vision.
I do agree with the point your making, however. Nice idea.