MasterIndex names the cartographic operator through which Socioplastics becomes a measurable, navigable, and positionable epistemic territory rather than an opaque accumulation of nodes, texts, images, DOIs, platforms, CamelTags, and conceptual fragments. Its fundamental proposition is that a distributed corpus requires not only density and sequence, but an overview capable of converting expansion into positional intelligence. If VerticalSpine supplies the axial backbone and MapDimensioning provides scalar measurement, MasterIndex renders those structures publicly traversable as a cartographic surface: each node can be situated by number, Core, Tome, Book, DOI, slug, platform, and relational cluster. At high-medium intensity, it mediates between the gravitational pull of GravitationalCorpus and the mutable formats of UnstableInstallation, ensuring that instability remains locatable rather than dispersive. Its practical manifestations include the Project Index page as living routing interface, DOI anchors as persistent coordinates, Hugging Face datasets as machine-readable terrain, and pedagogical protocols that allow diagonal reading, audit, citation, and entry from multiple publics. In Core V · Legibility Infrastructure, Socioplastics [2909] synthesises MetadataSkin, DualAddress, HybridLegibility, and SerialDissemination into a unified navigational apparatus, positioned after VerticalSpine and before LegibleArchive as the decisive passage from backbone to accessible archive. The case synthesis is architectural and territorial: like an urban plan, the index does not exhaust the city but makes its circulation, edges, districts, thresholds, and maintenance routes intelligible. Consequently, MasterIndex transforms long-duration research from cumulative archive into sovereign epistemic infrastructure. Its conclusion is unequivocal: cartography is not passive representation, but operational epistemology. Lloveras, A. (2026) MasterIndex — Socioplastics [2909]. Zenodo. https://doi.org/10.5281/zenodo.19920664
