  The EPR argument points to the existence of additional variables that are
necessary to complete standard quantum theory. It was dismissed by Bohr because
it attributes physical reality to isolated microscopic systems, independently
of the macroscopic measurement apparatus. Here, we transpose the EPR argument
to macroscopic systems, assuming that they are in spatially extended Fock spin
states and subject to spin measurements in remote regions of space. Bohr's
refutation of the EPR argument does not seem to apply in this case, since the
difference of scale between the microscopic measured system and the macroscopic
measuring apparatus can no longer be invoked.
