  We begin with a brief summary of issues encountered involving causality in
quantum theory, placing careful emphasis on the assumptions involved in results
such as the EPR paradox and Bell's inequality. We critique some solutions to
the resulting paradox, including Rovelli's relational quantum mechanics and the
many-worlds interpretation. We then discuss how a spacetime manifold could come
about on the classical level out of a quantum system, by constructing a space
with a topology out of the algebra of observables, and show that even with an
hypothesis of superluminal causation enforcing consistent measurements of
entangled states, a causal cone structure arises on the classical level.
Finally, we discuss the possibility that causality as understood in classical
relativistic physics may be an emergent symmetry which does not hold on the
quantum level.
