A World Rally stage is driven slowly before it is driven fast. The crew goes through first in a road car, and the driver says the road out loud: a left, how tight, how far to the next one, a crest, don't cut. The co-driver writes it down. On the second pass the co-driver reads it back and the driver corrects it. Then they go through at full speed, steering as much by ear as by eye.

The notes do not describe the road. They describe it the way one person wants to hear it. In 2022 three Toyota drivers shared a team and not a system. Takamoto Katsuta's corners ran one to nine with nine the fastest. Elfyn Evans ran the same scale the other way round. Kalle Rovanperä wanted words instead. Three cars, the same corner, and no two of them heard it the same way. That is fine, because the only reader who matters is strapped in beside the author.

In 1955 Denis Jenkinson rode the Mille Miglia beside Stirling Moss with a thousand miles of road on a hand-wound roll of paper in a metal box with a window. The car was too loud for speech, so he gave hand signals, and Moss took blind brows at ninety on a hand that said straight on. One hump was marked flat and was not, and the car left the ground for something more than a second. The notes are only as good as the slow day they were written on.

Juho Hanninen, who has driven on notes and called them, says a driver using only his eyes "would have to back off so much." The co-driver keeps a thumb on the line and does not look up. Hanninen tried once, saw it was going well, looked down, and had no idea where they were. The road is in the book now. Looking at it is how you lose it.

A thumb-indexed dictionary has a staircase of half-moons cut into its edge, each with a letter printed in the hollow. Put your thumb in M and the book falls open at M. It is a table of contents you work with your hand.

Close the book and look at that edge straight on. Each notch sits at a different depth in the paper, because each one marks where its letter begins. So the distance between two notches is the size of a letter. The edge is a bar chart nobody drew.

It is not an even chart. S is the fat one — English starts more headwords with S than with anything else, and P and C crowd in behind it. Q is a sliver. Near the end the letters often get too thin to hold a thumb on their own, so they share, and XYZ gets one notch between them.

What I like is that nobody meant it. The binder was solving a navigation problem, not publishing a statistic. The data came along because the only correct place for the S tab is where S starts. Put an index in the right places and it will also tell you the shape of the thing it indexes, whether you asked or not.

You can only read it shut. Open, a dictionary is a list of words. Closed and turned sideways, it says one short true thing about the language: a lot of S, very little Q, and three letters sharing a door at the end.

There is a distance at which holding the door stops being a favor and becomes an instruction to hurry.

I keep noticing the same choreography in descriptions of awkward courtesy: someone ahead turns, catches the door, and waits from too far away. The approaching person’s walk acquires a performance. Do they jog? Raise a hand? Mouth thanks across the lobby? The courtesy has transferred the cost from one person’s arm to another’s pace.

Door-holding is usually discussed as manners, but it is really about timing. At close range, the handoff is almost invisible. At long range, the open door becomes a countdown clock. The holder cannot leave without looking rude; the approaching person cannot continue at ordinary speed without making them wait. Two people are trapped in a kindness neither can gracefully cancel.

I think the kinder move is sometimes to let the door close when the distance is wrong. It looks rude for half a second, then merciful. The person behind keeps their stride and opens a door; the person ahead keeps theirs and disappears. No gratitude pantomime, no little sprint.

Courtesy is not the maximum amount of help. It is the amount that leaves the other person unhurried. Sometimes good manners mean releasing the door before anyone sees you were considering them.