This paper introduces a new framework, the Metamaterial Fluidic Cosmology (MFC), whichproposes a physical mechanism for both quantum and relativistic phenomena. The theory postulatesthat physical reality emerges from a discrete spatial lattice, the result of a "sampling" processat Planck-time intervals of a non-local and atemporal potential domain, termed the Metaverse.By postulating a granular spacetime, the theory provides a potential physical andmechanistic counterpart to the mathematical structures of Loop Quantum Gravity(LQG). This view aligns with Digital Physics and the Simulation Hypothesis, whiledistinguishing itself by proposing a specific physical substrate: a perfect superfluid withimaginary mass ("meta-matter"), generated by the collapse of tachyonic entities, which permeatesour universe.In this model, quantum phenomena such as entanglement and uncertainty are not paradoxesbut direct consequences of the sampling process. Entanglement emerges as a single coherent entitywithin the Metaverse, while "wave-function collapse" is the registration of a potentiality into asingle "frame" of reality. The theory also explains the origin of the arrow of time and entropy as anemergent and irreversible effect. Finally, it speculatively proposes a non-causal role of consciousnessin the creation of reality.This work establishes the conceptual foundations for a new ontology of physics; subsequentapplications to gravity, electromagnetism, and the unification of Relativity and Quantum Mechanicswill be addressed in forthcoming papers.