George Musser

“Indeed, the cluster doesn’t really have an “inside”—there is no volume of space where the D0-branes bustle around. Arguably there aren’t even any D0-branes anymore, either, because they surrender their individuality and become assimilated into the collective. If you look at a cluster from the outside, what you see isn’t the outer surface of a material thing, but the end of space; and if you poke your hand into the cluster, you will not reach into its interior, for the cluster has no interior. Instead, your hand will become assimilated, too (which can’t be good for it). If you wisely refrain from touching the cluster and instead throw particles into it, you will notice that the cluster’s storage capacity depends on its area rather than on its interior volume—again, for the simple reason that it doesn’t actually have an interior volume. Space has no meaning at this level.”
― George Musser, Spooky Action at a Distance: The Phenomenon That Reimagines Space and Time--and What It Means for Black Holes, the Big Bang, and Theories of Everything