I find this funny, because from thinking about the idea of empty space having topology, I went down a path of thinking that given light curves only slightly in

I find this funny, because from thinking about the idea of empty space having topology, I went down a path of thinking that given light curves only slightly in the gravitational fields, density variations and scales that we happen to inhabit, and also that we use it as our major sense, reality just happens to look reasonably Euclidean most of the time. However there are still a few acres missing due to gravity from the earth's surface, and other measurable discrepancies around, so while generally we can observe triangles behaving nicely and stuff, the strength of the concepts of space behaving nicely and straight lines existing is partly an accident of location and biology.