Full Idea
If two people can perceive the same object, as the possibility of any common world requires, then the object of an external perception is not in the mind of the percipient.
Gist of Idea
If two people perceive the same object, the object of perception can't be in the mind
Source
Bertrand Russell (Meinong on Complexes and Assumptions [1904], p.33)
Book Reference
Russell,Bertrand: 'Essays in Analysis', ed/tr. Lackey,Douglas [George Braziller 1973], p.33
A Reaction
This is merely an assertion of the realist view, rather than an argument. I take representative realism to tell a perfectly good story that permits two subjective representations of the same object.