ACORN Framework Booklet Series The ACORN framework is a geometric curvature–closure approach to fundamental physics in which mass, quantisation, and dynamical behaviour arise from closed circulation of intrinsic curvature channels governed by a compact canonical operator structure. From these canonical relations emerge invariant closure norms, quantised loop actions, and universal recurrence relations organising stable physical structure. The ACORN booklet series develops the consequences of this canonical framework across multiple domains of physics. Each booklet begins from the frozen Canon and explores how familiar physical phenomena arise as projections or consequences of curvature closure dynamics. This booklet examines the relationship between the ACORN framework and the Standard Model of particle physics. Within ACORN, stable matter arises from discrete curvature closure eigenmodes organised by integer loop synchronisation. Primitive residents such as the electron and proton correspond to particularly stable closure configurations within the admissible Matter Cone. When these closures are probed at high energies, temporary fragmentation of curvature circulation can occur, producing short-lived intermediate structures that appear experimentally as particle families. The Standard Model can therefore be interpreted as a phenomenological catalogue of such projection-level structures. Leptons, hadrons, and gauge interactions describe observable manifestations of curvature dynamics when closure structures are excited, perturbed, or temporarily disrupted in high-energy processes. Within this interpretation: • fundamental stability resides in closed curvature modes,• short-lived particle species correspond to transient curvature excitations,• gauge interactions reflect projection symmetries of curvature circulation,• and the Higgs mechanism describes effective mass generation within projection space. ACORN: The Standard Model therefore situates particle phenomenology within the broader curvature–closure framework, suggesting that the observed particle spectrum reflects projection-level organisation of deeper geometric closure dynamics. This interpretation preserves the empirical success of the Standard Model while proposing a geometric substrate from which its structures may arise.