Yes, and the point that I'm making is that "this isn't bias, this is physics" is missing the point. Yes, the way in which varying wavelengths of light interact

Yes, and the point that I'm making is that "this isn't bias, this is physics" is missing the point. Yes, the way in which varying wavelengths of light interact with varying configurations of bulk matter is a physical phenomenon, and not subject to bias. But that isn't the same as saying, as the comment to which I originally replied seemed to do, that no bias can exist in the way in which that phenomenon is interpreted by humans.