I just thought of a theory as to what the structure or Plan is, the greater picture we are yet to see.
This is the theory:
My theory is that before the universe began, there was nothing. Then the big bang happen, and the universe was created. But there was one layer, then it died out. But then the universe was created again in a completely different manner. But it had on thing in common with the first, and it would appear again in the whole seven layers.
Like the Land of Kent, Reason why, because our "Layer" has a Kent Waterfall state park, but not a Lighthouse. But in another Layer, there would be a Land of Kent with a Kent Waterfall, and a Kent Lighthouse. The Land of Kent would reappear in every 7 layers in the set.
Now the theory about alternate universe, that every choice we make, one of them might have a huge impact and create an alternate universe. Now, this would happen in one of the Layers, an then this would start a whole new "set" of seven Layers, the alternate universe would be like a mirror universe to the Layer it came from, but then it would then die out. And again, a new layer would be created that is completely different. But it would have one main thing that it connect it and create a set.
The image I posted above, the idea is that 7 of those dots are the seven main Layers, but the eight dot would be the original set that created an alternate Universe that would be Layer 1. All of the other lines that extended beyond the seven layers would be a possible point in which the Layer would then create an alternate universe.
The Exit would be in Layer 5, because, the alternate universe was created from that Layer. The concept of time is all the same with each layer. When Layer one was created, so was the rest of the layers as well. As we can perceives, because when we (the Player) cross between layers, it was a different layer, with its location being completely different from the other layer. But time is still the same. Like if it was in the period of ancient Rome in one layer, and if we were to cross into another layer, it would be the exact same amount of time since the beginning of the seven layers, and the same location in that layer own universe. But each layer would have a completely different universe with only one thing in common. Where an alternate universe is a point when one of the layers in a set create a mirror world of one of the layers, and it would then create 7 layers, where the first layer is the alternate universe of the layer from another set.
That would end up being the difference between the concept of a alternate universe, and a layer relation. Now the idea, or point of this is a natural point. Our universe, all the stars, space, and occupied space will eventually die. But it would then at some point be reborn where at some point in time the Layer would have something that is the exact same name, in the exact same location, it would then reappear over, and over again in each layer until it reaches the 7th layer. When the 7th layer dies, the universe will not be reborn. But during this 7 layer period, one of the layers will end up creating a mirror or alternate universe of itself, that then will create a new "set" of 7 layers.
The idea is to keep creation going, keep it alive. Seven layers would create a higher chance that one of them will create an alternate universe, and thus a new set of layers. This keeping creation going.