“Vignelli’s 1972 map wasn’t just lovely to look at. Its obsessive clarity turns out to be the perfect basis for digital information. It’s more modern looking than any of the maps that followed it. Now that people at the M.T.A. have figured out that this map is good for things other than dresses, why don’t they go the rest of the way, and bring it back as the basis for a more complete interactive map that will be kept live seven days a week?”