A golden Mercury leapt from the keystone of an especially grand arch halfway up the street. The gates below it were closed. But they were not locked. The Doctor pushed one of them open, and extended an arm, inviting Eliza to precede him. She hesitated and looked both ways. This was a habit from Versailles, where merely to step over a threshold in the company of a person constituted a Move in the social chess-game, sure to be noted, talked of, and responded to; indeed people there might devote hours to engineering the details: seeing to it that certain persons were in positions to notice the event, and encoding messages in who preceded whom. Here it was faintly ridiculous, and she knew it; but the habit died hard. She looked, and acquired the knowledge that her entry into the House of the Golden Mercury was witnessed by half a dozen persons: an idler collapsed in a doorway, a Lutheran minister, a widow sweeping a stoop, a boy running a message, a Jew in a furry hat, and a very large bearded man with one sleeve empty and the opposite hand gripping a long staff.