The photograph is the thing that will not shut up. You can burn the newspaper. You can jam the radio signal. You can cut the broadcast. You cannot unshow what has been shown. The photograph enters the eye and stays there. It moves into the memory and sets up permanent residence. The photograph does not argue. The photograph does not explain. The photograph shows. And what has been shown cannot be unshown.

Dorothea Lange was working for the Farm Security Administration in March of nineteen thirty-six when she pulled off a highway in California and took six photographs of a woman with her children in a pea-pickers camp. The woman was Florence Owens Thompson. She was thirty-two years old and hungry. Lange took the photographs and drove away and never got the woman's name. The photograph ran in the San Francisco News and within days the federal government sent twenty thousand pounds of food to the camp. One photograph fed thousands of people. Florence Thompson was never paid for the photograph. She did not know she was the face of the Great Depression until years later. The photograph made history. The woman in the photograph remained poor.

Mamie Till Bradley made a decision in September nineteen fifty-five that changed America. Her fourteen-year-old son Emmett Till had been murdered in Mississippi. The body came back to Chicago in a pine box. Mamie Till opened the casket and looked at what they had done to her boy and she said I want the world to see what they did to my son. She held an open casket funeral. Jet magazine published the photograph. Fifty thousand people filed past the casket in three days. The photograph of Emmett Till's face became the photograph that launched the civil rights movement. His mother understood what the cameras understood. That the truth has to be visible to be believed. That some things must be shown because words are not enough.

Nick Ut was a twenty-one-year-old Associated Press photographer in Vietnam on June eighth nineteen seventy-two when the South Vietnamese Air Force dropped napalm on the village of Trang Bang. A nine-year-old girl named Phan Thi Kim Phuc came running down Route 1 with her clothes burned off her body screaming in pain. Ut took the photograph and then put down his camera and drove the girl to a hospital. The photograph ran on the front page of every newspaper in the world. It did not end the war that day. But it moved inside the conscience of millions of people and it did not leave. The girl survived. The war ended. The photograph is still burning.

Gordon Parks photographed Ella Watson standing in front of an American flag with a mop and a broom in nineteen forty-two and called it American Gothic. Lewis Hine photographed children working in cotton mills in nineteen oh eight and his photographs helped pass the child labor laws. Jacob Riis photographed the tenements of New York in eighteen ninety and his photographs helped tear them down. The camera in the hands of someone who refuses to look away is the most dangerous instrument of democracy ever invented.

The powerful have always feared the photograph. They censor it. They classify it. They ban it. The Pentagon banned photographs of coffins returning from Iraq because the photograph would make the war real. The photograph is the opposite of propaganda. Propaganda tells you what to think. The photograph tells you what happened. The space between those two things is the space where freedom lives. The photograph does not take sides. The photograph shows what is there. And what is there is always enough.