​Interlude: The Absence of the "Hard Problem of Consciousness" in the Ontology of Differentiation

Contemporary philosophy of mind is preoccupied with what is known as the hard problem of consciousness, formulated by David Chalmers. This problem highlights a fundamental paradox: even a complete description of neurophysiological, behavioral, and cognitive processes does not explain why and how subjective phenomenal experience arises — the sensation of pain, color, taste, fear, or the inner what-it-is-like. Thomas Nagel, in his seminal essay What Is It Like to Be a Bat? (1974), emphasized this irreducible subjectivity, arguing that we can never fully grasp the experience of another being (e.g., a bat’s echolocation), as it is inherently bound to a first-person perspective inaccessible to objective description. This presupposes an ontological gap between structural organization and phenomenal experience.

Within the framework of the ontology of differentiation, however, such a gap does not arise. Phenomenality is not treated as a distinct metaphysical entity requiring special explanation. Rather, it is interpreted as a mode of sustained differentiation emerging at specific levels of differentiating organization. Qualia, in this context, are not private internal entities or residues of consciousness but distinctions retained within a bodily system, absent of reflection, yet already modifying behavior. They are neither illusions nor components of an “inner theater”, but also require no special ontological status. Their existence is a consequence of the stabilization of difference within a sensitive organism — not yet reflected as an act of differentiation. Pain, color, and fear are differences retained within modal configurations of the organism, connected to survival, orientation, and reactivity. Qualia do not reproduce the external world but encode it through modalities of resilient sensitivity. For a bat, echolocation is not a subjective experience detached from its body, but a difference retained in its sensorimotor system enabling spatial orientation. Phenomenality, therefore, is not the antithesis of structure but a modality of difference.

The model of levels of differentiation clarifies how qualia arise at level R₂, where behavior is temporally organized but not yet inclusive of differentiation of the differentiating itself. At level R₃, these differences are shaped into representations; at level R₄, they become objects of reflection, allowing one to conceptualize phenomenality as “my experience.” For instance, the capacity to reflect on the sensation of blue at level R₄ allows one not only to retain the difference as a quale (R₂) or a symbol (R₃), but to analyze how it structures perception, transforming it into an object of conceptual scrutiny. While Nagel claims that "being a bat" is inaccessible, within the ontology of differentiation this is not a metaphysical puzzle: the bat's experience is simply a difference retained by its bodily system at level R₂, which a human can distinguish at level R₄ through reflection — though not live through directly.

Indeed, we cannot know how a worm feels, but this is merely a feature of the metanodal architecture as a system of differentiation. Likewise, we do not know how precisely a conversational partner understands the word blue — what memories or affective tones it evokes — because we lack familiarity with their particular experiential history; nor can we know what it is really like for a musician to hear a certain musical work if we are not musicians ourselves.

The "hard problem of consciousness" arises only within frameworks that posit a dualism between structure and phenomenon — a dualism that the ontology of differentiation fundamentally rejects. Here, there is no ontological rupture between mechanism and experience, between body and subjectivity. Consciousness is not a layer above, but a transition between levels of retained differentiation. It does not arise as a function of the brain or as an intentional act, but takes form as a regime in which the differentiating becomes recursively self-differentiating. It is akin to the shift from direct computation to recursion: at level R₂, difference is fixed as operation; at R₃, as symbol; at R₄, as a system capable of analyzing itself via reflexive rules.

Thus, the problem identified by Chalmers and Nagel is not a problem of explaining consciousness per se, but of attempting to explain it outside the framework of differentiation. Phenomenality is not a mystery but a structure; consciousness is not an object but a process wherein difference becomes recursively differentiated. The ontology of differentiation eliminates the supposed ontological gap by showing that subjectivity is the sustained retention of difference — moving from embodied modality to reflection, from qualia to the conceptual articulation of their function.

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