from New York Times mags 9th annual year in ideas called “it happens when nobody is watching” and placed in a bus shelter in Berlin, was a one-time installation sponsored by Amnesty International. When a person in the shelter was looking at the poster, he saw, along with the words, a photograph of an amiable couple: a stocky, professional-looking man in a blue oxford-cloth shirt, his arm around the shoulders of his girlfriend or wife. If no one in the shelter was paying attention to the poster, though, the image switched: now the man was raising his fist against the woman as she leaned away and protected her face. (There was a slight lag in the switch, so viewers could notice that the poster was changing its image.)