Unless I'm missing something, this map might be pretty or impressive that it can be made, but it is entirely meaningless. Meaningless in that I don't know of significant meaning of breaking down the globe into 10° chunks whatsoever. This doesn't tell you anything about the cities shown, nor the area in which those cities exist. There is zero meaning in this map because no meaning can be derived from the filter process. The constraints have no relation to the data.

The article is cool that it takes a dive into the "odder" boxes and finds a flaw or two. The author also recognizes the arbitrary nature of the map. I imagine that almost any other filtering would be more interesting to geek out over though.

I am somewhat surprised by the popularity of this post here and on reddit, but then again that is sometimes how popularity works. The piece is presented well, just meaningless.