The Terminal Epistemic Boundary: Why All Limits

This paper examines the structural limits of knowledge, information, and de-scription in systems constrained by time. Rather than proposing new physicalentities or dimensions, the work develops a limit framework showing that obser-vation, inference, imagination, and information all presuppose temporal structure.We argue that beyond a terminal boundary—where time-dependent differentiationcollapses—concepts such as information, causality, and description become not un-known but undefined. This boundary is epistemic rather than ontological andapplies to any time-bound (4D) cognitive or physical system. The framework isformalized categorically and computationally, internally consistent, and aligns withknown limits in physics (horizons) [?], logic (G¨odel) [?], and computation (halt-ing) [?]. The paper clarifies why higher-order structures, if they exist, cannot beaccessed meaningfully from within time-bound systems.