The Slime Mould and the Crisis of Ground: How Physarum polycephalum Dissolves the Problem-Setting of Nihilism

Every major philosophical response to nihilism — from Nietzsche's revaluation of values throughHeidegger's question of Being, Camus's revolt, and Rorty's pragmatist dissolution — shares a structuralpresupposition: that the absence of justificatory ground constitutes a crisis requiring philosophical response.Even the enactivist tradition of Varela, Thompson, and Rosch (1991), which argues that groundlessnessneed not entail nihilism, preserves this frame by calling for the acceptance of groundlessness — an act thatpresupposes the ground/groundless distinction. This paper identifies a biological system that occupies aposition prior to that distinction. Physarum polycephalum, a brainless unicellular organism, finds optimalsolutions to mazes, produces transport networks rivalling human-engineered infrastructure, and exhibitshabituation — all without beliefs, intentions, or justification. The paper argues that having-a-telos(autopoietic self-maintenance) is categorically different from having-a-ground (justification accessible as abasis for action), and that justification is a cognitive economy measure, structurally superfluous in systemswith parallel embodied search. The result is a scope condition for nihilism: the crisis of ground is a featureof cognitive architectures with propositional content and costly verification, not a universal condition ofproblem-solving systems.