SemanticHardening designates the passage from metaphorical suggestion to epistemic durability: the moment a term ceases to decorate discourse and begins to organise a field. Socioplastics requires such resistant concepts because fragile language evaporates under institutional repetition, platform circulation, and critical fashion. Yet endurance alone would risk enclosure; therefore HybridLegibility becomes the methodological counterforce, ensuring that concepts remain readable across readers, repositories, curators, students, indexing systems, exhibitions, and machine environments. A socioplastic term must be precise without becoming private, transferable without becoming generic, and citable without being reduced to a keyword. SensoryTrace supplies the third scalar condition by returning abstraction to perceptual residue: the tag seen twice on a wall, the diagrammatic threshold of a façade, the rhythm of waiting in public space, the heat of asphalt, the friction of access, or the memory sedimented in a street. In the case of an urban archive, these operators clarify how a concept may be stabilised, catalogued, and materially recognised at once: SemanticHardening fixes its contour, HybridLegibility prepares its passage, and SensoryTrace anchors it in embodied encounter. The triad therefore proposes a public socioplastic grammar in which legibility is not simplification but structural responsibility. A concept becomes socioplastic when it is sufficiently hard to endure, sufficiently legible to circulate, and sufficiently traceable to be felt. Bibliography: Foucault, M.; Latour, B.; Hayles, N.K.; Rancière, J.; Stiegler, B.