# What are the consequences of a looping 3-dimensional space? [closed]

I was thinking of a world with a closed 3-dimensional space that would loop on itself. To describe it in another way: Forever traveling west, you came back to your starting point from east, same thing going south and north and forever. More importantly : digging the ground, you would end up falling from the sky.

To keep it simple, let's assume this universe is a cube. And Day/Night cycles, Seasons cycles would still be almost the same (even though I don't really know how it would work)

EDIT : Talking about scale of this universe, i would say something like 40,075km a side. I also forgot to mention that it would be a flat "earth" with a ceiling. (which would the same object as the ground).

How would that affect history, civilizations, religions, fauna, flora and physics in general ?

• Specify the size of the cube. If its small, e.g. solar system sized (or smaller), all manner of weird effects would occur. If its sufficiently huge, on the other end, its indistinguishable from our universe. – Durandal Jan 5 '17 at 19:47
• If sufficiently small for these effects to be felt, the question is too broad, as our whole world would be turned on its head (no pun intended). If sufficiently large (solar system sized), we wouldn't notice anything until very, very late in the game (sending probes out of the solar system), as it were, and even then, it wouldn't affect us too much. Last but not least, "not being into reality check" is irrelevant. People have a right to voice their opinions. And mine is that this question is too broad / opinion-based. – AndreiROM Jan 5 '17 at 19:57
• Along Durandal's thinking if when you say "assume this universe is a cube," you mean something the size of the observable universe that science explores, the effects would be imperceptible (as in would have no meaningful effect on humanity or even our planet). If you are assuming the universe is much much smaller (say, a few hundred kilometers), the story changes. – Cort Ammon - Reinstate Monica Jan 5 '17 at 20:16
• "How would that affect history, civilizations, religions, fauna, flora and physics in general ?" This is way too broad. Even if you just picked one (e.g., "How would that affect fauna?") it's way too broad. Worldbuild.SE is for when you have a specific question you need answered. – Azuaron Jan 5 '17 at 20:25
• This is what is usually a finite bounded space. The surface of a sphere is also a finite bounded space. Keep going in any one direction and you will return to your starting point, eventually. Our universe maybe such a space. If was scaled down to the size of a planet, people could feel shut in. However, the pre-Copernician universe didn't bother people. That was a finite cosmos. Perhaps, it would be as if they never abandoned the pre-Copernician worldview. See Arthur Clarke's short story "Wall of Darkness". – a4android Jan 6 '17 at 4:11