 Austin objects to every step in the argument just reconstructed. Amongst other complaints, he argues that key terms in the argument have not been properly defined or explained—for instance, “material thing” and “sense-data” (1962a: 4, 7–14, 55), and “directly” (1962a: 14–19). And he objects to the general principle, to which appeal was made in (iv), pointing out that there are no grounds for thinking that we cannot have experiences with different kinds of object that we nonetheless can’t discriminate on the basis of introspection. For instance, we might experience a bar of soap that looks just like a lemon, and be in a position where we couldn’t discriminate the soap from the lemon on the basis of introspection. Nonetheless, we would hold that the two experiences have different kinds of objects (1962a:  50–52).[22]  However, what are perhaps his most important complaints target (i) and (ii) by exploiting the distinction, initially articulated in “Other Minds” (1946), between two elements in perceptually based judgment: the opportunity afforded by sensory perception and judgmental acumen.