 If we identify the real state of a system with its qualitative intrinsic physical properties, then spatial separability is related to a separability principle stated by Howard (1985, p. 173) to the effect that any two spatially separated systems possess their own separate real states. It is even more closely related to Einstein’s (1935)  real state separability principle.  Indeed, Einstein formulated this principle in the context of a pair \(A, B\) of spatially separated systems.