3-manifolds have some pretty great descriptions to https://blogs.scientificamerican.com/roots-of-unity/a-few-of-my-favorite-spaces-the-three-torus/ https://blog

3-manifolds have some pretty great descriptions to https://blogs.scientificamerican.com/roots-of-unity/a-few-of-my-favorite-spaces-the-three-torus/ https://blogs.scientificamerican.com/roots-of-unity/a-few-of... Bill Thurstons Three-Dimensional Geometry and Topology is a great read