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Sense-data / Peacocke: the sense-data theory has characteristic spatial terms such as square or oblong sense data, etc. - but they are not spatially on a representational level. - This distinction keeps us from the error to ask "are sensory data surfaces?"
Sense-data / Russell / Peacocke: meet the sing-term positions in the sentence - real extensional constituents - with no way of presentation.
Chr. R. Peacocke
Sense and Content Oxford 1983