I started making isochronic maps about a year ago and became obsessed. Isochrone: "An isochrone is defined as "a line drawn on a map connecting points at which something occurs or arrives at the same time" (from an un-cited claim on Wikipedia ...). My original motivation was to better understand how geography confounds cartography in Vermont. The old saying "you can't get there from here" is still true; local rules rule locales. But the state doesn't always remember just how convoluted it is and when the distribution of resources fails to account for real-life contortions, the result can produce inequities. Put simply, if you live on a mountain surrounded by cliffs and rivers without a grocery store or paved roads, the state cannot count that town the same way it counts a well-paved city.
And look, I'm not the one saying things need to be equal -- the state says so. So, my effort was to develop this ... instrument for re-envisioning Vermont isochronically to promote equity and counter unintentional injustices. I built/am-building an app (separate from this website) to generate these maps. And then I fell in love with the images and now I care more about these maps as art than as a means to promote better governance, though the two are not mutually exclusive.
Disclaimer: The accuracy of the isochrones (the colored rings) cannot be verified because the polygon coordinates are generated by the proprietary algorithms of Berlin-based company Motion Intelligence.