 Far from Carnap’s atomic sort of protocol statements, Neurath’s model manifested a distinctive complexity of terms and structure (“aggregations”). The protocol contains a factual physicalist core in terms about the table and its location. It also contains the experiential term that provides the linguistic recording of the empirical character of protocols, that is, their experiential origin. Neurath was mindful to caution here that perception terms only admitted physicalistic meaning in terms, for instance, of physiological mechanisms of perception. It also contains the declarative level, marked with ‘Otto says’, which distinguishes the protocol as a linguistic statement. Neurath insisted, again, that the statement had a dual nature, linguistic (propositional and communicative) and physicalist in the form of a physical and physiological process. Finally, the other distinctive elements were the name of the protocolist and the times and locations of the experience and the reports, which provided an intersubjective , physicalist, public alternative to Carnap’s subjective ‘I see a red circle here now’. (Note, however, that for Carnap, the idea of self itself is a constituted concept.)