 Some philosophers argue against this proposal on the grounds that it is not adequate to the phenomenology of seeing objects, wherein one always (it is said) seems to see a particular object. The simple existentially quantified contents, it is said, cannot reflect the phenomenology of being visually presented with a particular object. (For this line of criticism, see Campbell 2002 ch. 6, Soteriou 2000, Martin 2003, Burge 1991.) Others go further and say that only contents that could naturally be expressed using a demonstrative expression putatively referring to the seen object will be adequate to this phenomenology. (Campbell 2002 ch. 6)