The obvious crack along the top of this photo of Lincoln from February 1865 occurred just after the photographer captured the image. David C. Ward, historian at the National Portrait Gallery, explains how this picture has become a work of myth, suggesting that at the very moment of success, an accident can occur.

This video series, "Explore with Smithsonian Experts," connects students and teachers with the skill and technique of Smithsonian experts who describe their work at our nation's museums. In each short film, experts introduce new ways to observe, record, research, and share, while using real artifacts and work experiences. Supports Common Core ELA standards.

Produced by the Smithsonian Center for Learning and Digital Access and Pearson Foundation.