SyntheticLegibility names the condition through which a corpus becomes usable without demanding total comprehension. Within Socioplastics, legibility is not transparency: a field that requires complete mastery excludes all but initiates, while a field that simplifies itself into slogans forfeits density. Synthetic legibility allows readers, planners, artists, coders, or students to grasp enough of a corpus for a specific operation while leaving other strata productively opaque. Yet partial understanding requires navigable structure. LegibleArchive supplies the architectural scaffolding through which density becomes traversable: vertical spines, master indexes, metadata skins, tags, thresholds, cross-links, repositories, and sequenced entrances transform a heap into an oriented field. It does not flatten complexity, but distributes it along gradients of access. ActivationNode then marks the event through which latent structure becomes kinetic: a citation, query, DOI resolve, syllabus inclusion, threshold crossing, search-indexing event, or productive misreading initiates circulation. A specific pedagogical case clarifies the triad: a student may enter Socioplastics through a single CamelTag, follow an indexed path into related nodes, and activate the wider field by citing, annotating, or reusing that operator in another context. Together, SyntheticLegibility permits partial use, LegibleArchive provides navigational order, and ActivationNode supplies ignition. A living field is not fully transparent, nor merely well catalogued; it is sufficiently understandable, structurally signposted, and ready to spark.