SOCIOPLASTIC-CENTURY-PACK-2900 establishes LAPIEZA not as a subsidiary corpus but as the relational stratum through which Socioplastics becomes historically verifiable, publicly legible, and materially continuous. Spanning 2009–2025, it gathers one hundred canonical entries into a chronological deposit where exhibitions, collaborations, pedagogical situations, curatorial experiments, material episodes, and distributed interfaces become a durable archival ecology. Unlike the 2800 pack, which foregrounds works by Anto Lloveras, the 2900 pack records the wider field in which LAPIEZA operates as platform, agency, collective signature, and long-duration infrastructure. Its repeated metadata formula—LAPIEZA · ANTO LLOVERAS · SOCIOPLASTICS—functions as an indexing device, binding authorship, searchability, public memory, and conceptual continuity. Through sequences such as Bancal, Fresh Museum, Cosmotidiano, Twins, Butter Factory Norway, Corn-Brutalism, Smoke, Tar, Road Restoration, Radiance, Stone Dream, and Copos, LAPIEZA emerges as a living archive capable of producing encounters, atmospheres, objects, texts, protocols, and temporary institutions without relying upon permanent institutional shelter. The case of its Blogspot-based chronology is decisive: each URL operates as EnduringProof, converting fragile events into retrievable public matter. Consequently, LAPIEZA demonstrates that PlasticAgency is not merely artistic intervention but infrastructural authorship: the capacity to shape collective matter across time. In conjunction with the 2800 pack, it forms a double foundation—work and platform, action and archive, practice and relation—against which the theoretical cores of Socioplastics must be tested.