This rare moment of emptiness. We took the Picadilly Line a lot, which requires a journey to several stories below, as you can see from this escalator. It’s nothing to Londoners, but I sometimes had to take a breath and hold on to deal with the crowds, dizzying descents, packed elevators and whole undergroundness of the thing. I would normally just walk the extra km but we were zipping around town and for that, the tube is fabulous.