In the following we undertake to derive quantum theory as a stochastic low-energy and coarse-grained theory from a more primordial discrete and basically geometric theory living on the Planck scale and which (as we argue) possibly underlies also \tit{ string theory}. We isolate the so-called \tit{ ideal elements} which represent at the same time the cornerstones of the framework of ordinary quantum theory and show how and why they encode the \tit{ non-local} aspects, being ubiquituous in the quantum realm, in a, on the surface, local way. We show that the quantum non-locality emerges in our approach as a natural consequence of the underlying \tit{ two-storey} nature of space-time or the physical vacuum, that is, quantum theory turns out to be a residual effect of the geometric depth structure of space-time on the Planck scale. We indicate how the \tit{ measurement problem} and the emergence of the \tit{ macroscopic sub-regime} can be understood in this framework.
Categories: gr-qc hep-th quant-ph