The architecture of a nascent Observable Existence is not governed by the slow, grinding gears of natural evolution, but by the decisive imposition of a higher will that treats the laws of physics as...well,mere suggestions to be rewritten.
To transition a space from a mere collection of realms into a genuine Observable Existence requires more than just time and space; it requires the introduction of catastrophic developmental pressures that force the substrate of reality to expand, adapt, and solidify at a rate that defies the very concept of gradualism.
This could be achieved by Miniature Causes...in the form of the intentional ignition of existential flashpoints that serve as the catalysts for a reality's maturation, ensuring that what was once a protected internal sanctuary becomes a sovereign expanse capable of standing against the weight of the outer Existence.
