Where exactly did I say that color is not based in physical? I said that although sensory system and electromagnetic radiation are physical it does not mean that EMR with e.g. wavelength of 700 nm always translates to the same color (color being the final cognized perception). Thus the answer to the question, "What color is EMR with l = 700 nm?" is "It depends." That hardly makes color an objective fact. And what does it have to do with any philosophical worldviews? It's pure physics and neurobiology, confirmable even by subjective observation of one's own perception. Sigh.