This book advances the thesis that a just society must be understood as an organism—a living, differentiated, interdependent whole—and not as a system governed by any -ism. It argues that every -ism is a mythological architecture: a story that claims to be destiny, a module that has forgotten it is a module, a bluff that performs certainty where uncertainty actually lives. The book traces the layered evolution of the nervous system—from the lizard brain (survival) to the mammalian brain (care), the ape brain (tribe), the human brain (imagination), the planetary nervous system (global connection), the mycelial weave (distributed intelligence), and the space between (relationship). Each layer is examined as both a biological inheritance and a social metaphor. The book then proposes four practices—grafting, remodeling, regeneration, and circulation—as the principles of a just society. It concludes that justice is not a rule, a system, or a doctrine, but a relationship, a circulation, a response, and a becoming. The Living Rule is the recognition that we are already an organism, already connected, already alive—and the question that keeps asking itself: "What do we need to become right now?"