Daguerreotypes, among the earliest forms of photographs, are unique images on highly polished silver plates. The process was developed by Louis-Jacques-Mandé Daguerre in France, and, when revealed to the public in 1839, quickly spread around the globe. This portrait by Philadelphia maker Marcus Aurelius Root is a small masterpiece that shows his efforts at artistic photography. "Sarah Hawkins (Aunt Sadie)," around 1845–55, by Marcus Aurelius Root










