I've long been obsessed with transport maps. The Tokyo rail network is a work of art and I have always admired the works of Massimo Vignelli (NY subway map) and Harry Beck (London Underground map).
I jumped at the chance to create a map (of sorts) that shows the pricing of virtual connections from one country/region to another.
I studied the 3 maps I mentioned earlier and realised the important of consistent spacing and uniform angles. It took _many_ iterations but I'm finally at a version that I am happy with (...until someone adds another country/zone... lol)