The current obsession with photographic self-portraits - The Selfie - can be traced back to the origins of photography. One of the first things photographers did when they learned how to fix light on a surface was to turn their rudimentary cameras on themselves. The earliest known example comes from 1839, the same year that Louis Daguerre patented the 'invention' of photography as a commercially viable process. Since then, the self-portrait, a genre inherited from painting, has become a staple form of photographic image making.