ABSTRACT
Wittgenstein is commonly read as an ally of those who are skeptical about the existence of qualia.2 A skeptic about qualia either flatly denies the existence of such properties or he says that supposing such properties were to exist, we could know nothing about them.3 Wittgenstein might be thought a skeptic in the first sense when he argues against the possibility of widespread color inversion, such that we could not know that another person doesn’t see colors entirely differently from ourselves. Anyone who accepts the existence of qualia will typically also embrace the possibility of such a scenario. Indeed, thought experiments involving widespread spectrum inversion are standard ways of arguing for the existence of qualia.4
