Lupi hopes eventually to turn the idea into a children’s book. “I’ve always been fascinated by trying to unpack what I believe can be really a magical way to see what we usually complain about,” she said. “Because as much as, sure, we want them to not have raised the prices, or to be more on time, or to be less crowded, I kind of see it as this magic underground landscape.” Or aboveground, as it were: one of the nice things about the video is the way in which it sorts the various train lines by their relative exposure to sunlight. The N and the Z, for instance, cover more miles up top than below, while the R travels the farthest in darkness.journey-inline-newsletterinline-newsletter