 Moreover, suppose we accept the Fregean view that the meaning of a term determines what the term refers to (or in Carnap’s words, that “intension determines  extension”).[7]  Then, given the different referents, the twins’ terms must have different meanings as well. But Oscar and Twin Oscar are physical duplicates; so it appears the meaning of ‘water’ is not wholly fixed by speakers’ internal states. Rather, the environment also figures into  it.[8]