This paper rigorously analyzes the physical status of observation under a strict mechanism-only, logical-necessity framework. Treating observers as finite physical systems, it demonstrates that observation is neither a passive description nor a mechanism that enforces the intrinsic dynamics of the observed system. Instead, observation is shown to be a distinct class of physical enforcement: it requires real energy expenditure, dissipation, and irreversible state change, but this enforcement acts exclusively on the observer and its records, not on the target system’s evolution. By separating system-enforcement from record-enforcement through removal and invariance tests, the paper establishes observation as a necessary meta-enforcing mechanism that stabilizes outcomes and descriptions without altering underlying physical dynamics.