This book offers a reconstructive argument for consciousness that begins not with qualia or the hard problem but with the question of what life is. It starts with the simplest self-maintaining process and builds step by step, introducing concepts only when the subject demands them and grounding each logical step in empirical findings from biology, physics, chemistry, evolution, neuroscience, and systems theory. The conclusion is that consciousness is not an addition to a physical system but the way a specific type of organization is given to itself. The book includes empirical illustrations and theoretical digressions that can be skipped without breaking the argument's thread.
Criticality in autopoietic (living) systems is not merely a state the system can be in, as in non-living dissipative systems, but a mode of operation that defines the system as living. This mode, present from the earliest autopoietic systems, develops qualitatively new forms as the nervous system scales. In the nervous system, this mode realizes non-factorizability as a stable operating condition. This reframing clarifies that epilepsy and coma are not opposite ends of an activation spectrum but structurally distinct failures of this critical mode in opposite directions.
The concept of the soul is often dismissed as obsolete in scientific discourse, yet the question of what makes an organism a subject—an inner point of action, perception, and self-reference—remains unanswered. Behaviorism, cognitivism, Freudian psychology, and modern neuroscience have each circumvented or dissolved this inner center rather than explained it. David Chalmers' hard problem of consciousness, asking why subjective experience exists at all, is argued here to be not unsolved but misconceived: it wrongly presupposes that experience is something added to a physical system. The article proposes that this presupposition is false, redirecting the inquiry.