A field does not grow in a straight line. It spirals. The HelicoidalAnatomy names the helical structure through which a corpus advances: not linear progression, but spiral return — each turn revisiting earlier territory at a higher level of organization. In biology, the helix is the fundamental form of growth: DNA coils, shells spiral, horns corkscrew. In epistemic architecture, the helix is the fundamental form of field development: concepts return to earlier nodes but transformed by the distance traveled. The Socioplastics corpus demonstrates this structurally. Tome I establishes foundational concepts. Tome II returns to those concepts but at a developmental scale. Tome III returns again but at an expansive scale. Each return is not repetition. It is helical ascent. The HelicoidalAnatomy makes this explicit. It identifies the pitch of the spiral: how much vertical advance occurs per turn. It identifies the radius: how far the field expands laterally with each cycle. It identifies the chirality: whether the spiral winds clockwise or counterclockwise — whether the field advances by consolidation or by dispersion. These are not decorative metaphors. They are structural parameters. A field with too tight a pitch becomes dense but narrow. A field with too wide a radius becomes broad but thin. The HelicoidalAnatomy is the diagnostic tool that measures these parameters. Node 996 places this concept in Core II — Structural Physics — because the helix is a structural form, not a thematic content. It is the shape that the field's growth takes. Without this concept, growth is understood as accumulation. With it, growth is understood as spiral ascent.
