of a parallelism of network behavior and microscopic behavior of the quantum vacuum.

We now come to a detailed analysis of the microscopic pattern of vacuum fluctuations. In sect.4 of [@Requ1] we made a calculation which shows that, given the huge number of roughly Planck-size grains in a macroscopic piece of space and assuming that the individual grains are allowed to fluctuate almost independently, more precisely, some grain variable like e.g. the local energy, the total fluctuations in a macroscopic or mesoscopic piece of space of typical physical quantities are still so large (i.e. macroscopic) that they should be observable. Note that with the number of nodes of roughly Planck-size, $N_P$, in a macroscopic volume, $V$, being gigantic, its square root is still very large (for the details of the argument see [@Requ1]). More precisely, with $q_i$ some physical quantity belonging to a microscopic grain (e.g. energy, momentum, some charge etc. and taking for convenience $\langle q_i\rangle$=0) and $Q_V:=\sum_i q_i$ being the observable belonging to the volume $V$, the fluctuation of the latter behaves under the above assumption as $$\langle Q_VQ_V\rangle^{1/2}\sim (V/l_p^3)^{1/2}$$ with $N_P\sim V/l_p^3$ the number of grains in $V$. This is a consequence of the [central limit theorem]{}. 