Universe spawn

A universe spawns from another one when it is created using that one as an inspiration.

It can be said that every known universe has spawn from the real world, because every fictional universe was somehow inspired on it.

It might also happen that only a single element within a universe spawn from another universe. It should be noted, however that when an element of a universe spawns from another one, it is created with a present, a past an, possibly, a future, so it the moment a element starts existing in an universe, it could have always existed in it, because its past is instantly written.

When many universes in a multiverse spawned from one single original universe, that universe is called the Prime Universe.