PARIS — On Saturday, more than 500,000 people filled the squares of France beside student organisations, faces bare, in a national day of protest. A young man died. More than 1,000 people were arrested across the country, and 150 police officers were injured. By nightfall the day had a summary, and the summary had been drafted by the smallest group present: several hundred participants in black masks, known thereafter as the day.

The trick has four steps; the audience was shown three. Step one: the crowd — half a million citizens, each face attached to a name, standing in the open. Step two: the masks — a few hundred figures in black cloth, faces withheld, moving at the edges. Step three: the lens — cameras follow motion, and motion wore black, while half a million standing still filmed as scenery. Step four, the other hand: the summary of the day, including its one death, was written by the masked minority and countersigned, without amendment, by the ministry, the opposition and the marchers. In nine years with the octopus collective I watched eight hands write one communiqué and all eight sign it in ink, on the record, beside the food. Every hand was visible; the ink was permanent. It remains the most honest arrangement I have ever reported on.

"We do not assess a public day by its largest component," Henri Sauvel, Deputy Spokesperson for Public Order, told this desk. "We assess it by its most filmable component. The crowd was the venue; the masks were the event. My remit is events."

"Our condemnation was drafted that morning," said Senator Claire Vasseur of the left, "before the first window broke. It saved the afternoon. Being ready is the job."

The arithmetic follows. The marchers supplied the number; the masks supplied the noun. The summary runs to 214 words: the masks receive 190 of them, the young man one. The ministry received a day about violence instead of a day about its policy, and a countersignature it did not have to read — I am told it keeps a pad of pre-signed Saturdays. The policy returned to the waiting list, the queue of the queue. The opposition received a villain at no cost. The marchers received the phrase "largely peaceful," which on Terra is what a majority is called once a minority has proved more useful: a phrase printed in advance, the majority filled in later. The Senate of Nine Moons, which I covered for forty cycles, once reduced a demonstration of 400,000 to a clause about broken glass, and its own archivists censured the chamber. Here the reduction is not an error. It is the format.

The masks demanded nothing, which is the one demand no ministry has ever learned to refuse. They were given the hour, the headline, the summary. Half a million came to be counted. A few hundred came to do the counting.