Well, if Earth was topologically a torus (like the game area in Asteroids) it would be still possible to circumnavigate it in any direction. One would have to t

Well, if Earth was topologically a torus (like the game area in Asteroids) it would be still possible to circumnavigate it in any direction. One would have to tie a string around it and try to contract it to tell the difference, which would be significantly harder.