A hypothesis of local causality is proposed, according to which the causal structure is formed independently within each inertial frame of reference (IFR), and the notion of an event is defined only within the bounds of the observer's cognitive accessibility. Space and time are not treated as fundamental entities, but rather as emergent cognitive constructs arising from the consistent reconstruction of causal relations. A distinction is introduced between direct (external) and observable (cognitive) transformations, corresponding respectively to formal mappings of causal structures and internally consistent modifications of the observer's memory. It is shown that cognitive structures may differ even between observers within the same IFR, and their reconciliation requires admissible cognitive interaction. Using a scalar field model on two-dimensional Euclidean space, it is illustrated how multiple spacetimes can emergently arise from a single underlying superstructure. Conditions are established under which observable transformations take the form of Lorentz transformations as cognitively coherent transitions between IFRs. Physical implications and future directions are discussed, including the cognitive nature of matter and time, and the possibility of describing interactions without reference to global spacetime.