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The cellular structure of Voids and shells [or equivalently, some people call the edges of the shells 'walls' and 'filaments' made up of tens of thousands of galaxies] is supposedly produced in the so-called 'cosmological simulations' of galaxy formation.
However it is not clear to me that gravity naturally produces this sort of structure. One does also wonder if a mere 14 billion years is enough time to produce supergalactic structures on the vast spatial scale that we do observe them. (individual structures that are hundreds of millions of light years across, in some cases).
I have always wondered, given the rather tight time limitation of only 14 billion years in the Big Bang model, if this is really enough time for these enormous supergalactic structures to form.
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