[bocuoafx] Surface of a hypercube

Probably the easiest non-Euclidean 3D manifold to model, perhaps for flying around in virtual reality, is the surface of the hypercube.

What happens at the corners?  Probably easiest is you can see into neighboring cubes, but you cannot see "around the corner" into neighbors of neighbors.  Or maybe you can; things get weirdly replicated as if some strange mirror.