I am not saying that philosophies, since they are speculative, speak of the nonexistent. When they say 'subject' or 'class struggle' or 'dialectics',… - Umberto Eco

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I am not saying that philosophies, since they are speculative, speak of the nonexistent. When they say 'subject' or 'class struggle' or 'dialectics', they always point to something that should have been defined and posited in some way. Philosophies can be judged, at most, on the grounds of the perspicacity with which they decide that something is worthy of becoming the starting point for a global explanatory hypothesis. Thus I do not think that the sign (or any other suitable object for a general semiotics) is a mere figment.