  The construction of black-hole lattices, first attempted by Richard Lindquist
and John Wheeler in 1957, has recently been tackled with renewed interest, as a
test bed for studying the behavior of inhomogeneities in the context of the
backreaction problem. In this contribution, I discuss how black-hole lattices
can help shed light on two important issues, and illustrate the conclusions
reached so far in the study of these systems.
