Spies were supposed to have a strong intuitive sense of when they had been noticed, when someone else’s eyes… — Neal Stephenson

Spies were supposed to have a strong intuitive sense of when they had been noticed, when someone else’s eyes were on them. Or at least that was the line of bullshit that the spycraft trainers liked to lay on their students. If true, then no Western spy could tolerate even a few seconds’ exposure to a Chinese street… If they had dressed up in clown suits, strapped strobe lights to their foreheads, and sprinted out into traffic firing tommy guns into the air, they would not have drawn more immediate and intense scrutiny by entering this public space as non-Chinese persons… They were not merely noticed. They were famous.

Source: Wikiquote · CC BY-SA 4.0