I got stuck for a minute on the caption "Harry Beck’s 1933 map of the London Underground" to: https://substackcdn.com/image/fetch/$s_!VsWm!,f_auto,q_auto:...

which contains Heathrow Terminals 1, 2, 3, 4 & 5 on the Picadilly line. For about 15 seconds I imagined a world where Heathrow has had 5 terminals since 1933, then I read the map itself: "Recreated by Arthurs D". Phew.

Awesome example of improving information conveyance through abstractions though!