A single unidentified man, clutching shopping bags, stepped into the path of a column of People's Liberation Army tanks on Chang'an Avenue and held them for over half an hour. The standoff, captured on June 5, 1989, the morning after the Chinese government's violent suppression of the Tiananmen Square protests, became one of the most reproduced photographs in history. For weeks, hundreds of thousands of students and workers had filled Tiananmen Square in Beijing demanding democratic reform; the army moved in on the night of June 3, 4, and estimates of those killed range from several hundred to several thousand. The lone figure's act of defiance gave the massacre a human face the world could not look away from. China has censored the image ever since, and the question of who he was remains unanswered, a silence that itself speaks to the enduring tension between the Chinese Communist Party's grip on memory and the world's refusal to forget.