Living Versus Inanimate: The Information Border
The traditional divide between nature and culture restricts to the latter the use of information. Biosemiotics claims instead that the divide between nature and culture is a mere subdivision within the living world but that semiosis is the specific feature which distinguishes the living from the inanimate. The present paper is intended to reformulate this basic tenet in information-theoretic terms, to support it using information-theoretic arguments, and to show that its consequences match reality. It first proposes a receiver-oriented interpretation of semiosis. This interpretation implies that the means for recording, storing and processing information exclusively reside in the living world (extended so as to include the artefacts it produces). Then it may be argued that the main difference between the inanimate world and the living one lies in the fact that the very existence of the latter relies on information, which on the contrary is not relevant to the former. Thus, besides matter and energy, information is an entity irreducible to them which must be taken into account in any attempt for describing and understanding life. Information can interact with the real world only provided it is borne by some physical support: it must be physically inscribed. Contrary to matter and energy, information can be shared, not necessarily exchanged, so a same information can be borne by a number of distinct supports. Any living thing possesses means for recording, storing and processing information which are necessary for keeping it alive and securing its progeny. In particular, its genome contains hereditary information, can be replicated, and instructs the construction and maintenance of a phenotype. The simultaneous existence of a phenotype and of a genome, where the latter bears the symbolic description of the former, is mandatory for enabling the self-reproduction of an organism. Bearing and using information then endows a living thing with the ability to decrease the physical entropy, hence to act as Maxwells demon. Not only its own life is maintained against physical entropy, but its self-reproduction multiplies clones of the demon. Taking information as the entity which differentiates the living from the inanimate also supports Rovellis relational interpretation of quantum physics. Experimental apparatuses then appear as information-theoretic channels from the inanimate world to a living observer. Besides having its own perspective (as stated by Rovelli), each of these channels has its own horizon because its capacity is necessarily finite. As another consequence, we may assert that the physicists quest of a theory of everything is doomed to failure since, for lack of considering information as a relevant entity, physicists deny the living world, hence themselves.
receiver-oriented interpretation of semiosis maxwells demon living vs inanimate divide information theory symbolic information