It turns out that traveling salesmen would map out the routes they had either walked or traveled and the started to see that they were forming artwork on their maps depending on how their European streets were mapped out.
Of course these pieces are not the route someone has walked. This is the artwork someone has created from the TSP (traveling salesmen's Problem). They are one continuous line that weaves in and around. In fact it might be the best mazes in the world. Since none of the lines ever touch.
Do you think you could find the beginning or the end of these lines? Would this be a project you would ever like to try? Do you think you could do it?
If you want to see more look up TSP art.