Looking at some of the comments, I wonder if the blog post would have been less confusing if I gave it the more appropriate title "Living in a Torus".
About a paragraph of explanation setting out your axioms and explaining that you are discussing the shape of the universe, of a finite bounded spacetime continuum, was needed.
And ideally, several paragraphs of explanation, building up slowly, was what you really needed. Starting with examples of a linear 1D continuum where you can only move in 1 dimension, and how it would look, then of a 2D one where it's possible to go round the axis, then a planar one, then illustrations of how the planar one's edges could be connected. It also needed explanations of the notions of flatness and curvature, of connectivity, and some basic explanations of the topology involved.
As it was, nothing was explained: just a cryptic title that contradicted the misleading first line. :-(
Sorry to be a harsh critic, but as an educated layman who's read entire books on topology, spacetime, definitions of connectivity and dimension and so on, this was totally opaque and mystifying.
If you'd at least given it that 1-para context, it might have worked. Even a sentence of context. But just jumping into a complex thought experiment? Impenetrable.