The Multiverse is the total collection of all extant universes with their unique states. If viewed "from a distance," creation appears as a collection of individual universes or bubbles with their own creative space and their own barrier which protects and isolates them one from the other.
Each bubble in the multiverse represents a complete and individualized universe with it's own unique and distinct state of creation. Bubbles (i.e., universes) are created when consciousness partitions itself into large groups with a specific interest in exploring various states. The condition of the barrier depends entirely upon the conditions of consciousness (i.e., how strict participating monads are when it comes to excluding ideas and conditions which would modify their chosen state.).
The Book of Light Volume Two