As in world of word, there are visible worlds and invisible worlds. The smallest world which accommodates the player is the visible world to him/her. The smaller worlds in it, and the bigger world which this visible world belongs to are invisible. People can see things happening either because of the actions that are taken in this world, or they are reflections of the control from invisible worlds.
The 2nd sketch shows that there are no real external boundaries of the world system, as it is an infinite loop. However, the worlds in my world system are not just copies like this.
I’d like to consider the territories as how far the “control power” could work, and the exit as how to stop this crazy control.