Perceptual Relativism
What color is the chair? I say it is red. Someone may say that to a colorblind person, it is not red. We have different sense experiences of the objects, and why favor one perceiver over another? So this kind of perceptual relativism is true. The case may be over stated. To speak of colorblindness is still to use reference to our own perceptions to describe others and their perceptions. So one cannot appeal to relativism, which is an attempt to detach from one's own perceptions, without appealing to the abandoned perceptions. The color blinded example is still explained in terms of our own perceptions, and so is self contradictory. Use and apply to insects, aliens, etc. For more, see here .