 A somewhat different motivation for narrow content (Loar 1988) appeals to the idea that we have introspective access to the contents of our own thoughts. In particular, it seems that we should be able to determine introspectively whether two of our thoughts have the same content or not. But the kind of difference in content that distinguishes Oscar’s thoughts from Twin Oscar’s thoughts seems to be the sort of difference that they could not in principle be introspectively aware of. From the inside, so to speak, there is no way for Oscar and Twin Oscar to tell whether they are thinking XYZ-thoughts or H2O-thoughts. (Recall that they are unaware of what the microstructure of the substance they call “water” is, although they assume that it has one.) The difference in broad content between the beliefs of Oscar and Twin Oscar seems to be a difference to which they themselves have no access.