In 1948, W. Eugene Smith was commissioned by Life Magazine to profile Dr. Ernest Guy Ceriani, a traveling doctor who provided 24-hour care to residents of the small Colorado town of Kremmling — work that has come to epitomize the photo essay narrative. Part of its power lies in Smith’s “wallpaper” approach to photography — he faded into the background so he could capture intimate moments, notes PDN. Explore the landmark series in a video from All About Street Photography that has been featured around the web.