People have looked for hints of this sort of thing without success so far. https://en.m.wikipedia.org/wiki/Shape_of_the_universe#:~:text=In%20a%20universe%20wi

People have looked for hints of this sort of thing without success so far. https://en.m.wikipedia.org/wiki/Shape_of_the_universe#:~:text=In%20a%20universe%20with%20zero,the%20torus%20and%20Klein%20bottle https://en.m.wikipedia.org/wiki/Shape_of_the_universe#:~:tex....