Library of Congress to archive daguerreotype of Greta Thunberg posing on Sioux reservation

She visited the reservation to discuss climate change with students from Standing Rock High School.

During the stop, she posed for a photograph by Shane Balkowitsch. The image was preserved on a glass plate in a daguerreotype, a 150-year-old form of photography. Balkowitsch told the Bismark Times that the two original photographs he took of Thunberg will be preserved in the Library of Congress and the Swedish History Museum in Stockholm.

Balkowitsch titled Thunberg’s picture “Standing For Us All” and called the images his “most important work to date.” He is currently working on a 15-year-long project to capture the images of Native Americans using his antiquated method of photography. He had just 15 minutes to take photographs of the young activist. The result was two 8-by-10 pictures etched using chemicals that are likely to outlast standard print photographs.

Thunberg shared the photo on Twitter before boarding her “zero emissions” sailboat en route to her next stop on the global stage.

While in the U.S., Thunberg spoke before the United Nations and attended several climate change rallies. She also caught the attention of President Trump, who tweeted that Thunberg has a “bright and wonderful future” and joked that she looked like a “very happy girl” following her solemn U.N. speech.