Sally can demonstratively identify Bill and thereby have thoughts determinately about Bill rather than his qualitative twin Bill*.

So far we have argued that demonstrative identification is not reducible to descriptive identification. But Strawson makes the stronger claim that, in the reduplication universe, descriptive identification depends on demonstrative identification. To get this stronger claim consider an object that Sally has never perceived but can intuitively think about — say, Bill's mother. Strawson claims that considering this case proves false the claim “that where the particular to be identified cannot be di