 While strictly outside the domain of classical physics, quantum phenomena such as the  Aharonov-Bohm effect  may be considered manifestations of nonseparability and holism even in classical electromagnetism. Nonseparability would be a trivial notion if no qualitative intrinsic physical properties were ever assigned at spacetime points or in their neighborhoods. But this would require a thorough-going relationism that took not just geometric but all local features to be irreducibly relational (cf. Esfeld (2004)). We will return to this point in our discussion of the  Aharonov-Bohm effect.