What is anonymous photography, and why is it today at the centre of growing interest in the art and collecting system? This book addresses anonymous photography - vernacular, orphan or found - as an autonomous field of visual culture, and proposes an eight-point manifesto intended as a first attempt at focus: not exhaustive, not conclusive, open to further contributions and developments. Through the definition of a historical period (1826-1999), an operative glossary and a reflection on the processes of recognising value, the volume presents itself as a tool for understanding this area of photography, including within the context of the market and collecting. A section of images accompanied by evaluation cards, written by the gallerists who offer them, completes the project, inviting the reader to question the criteria of reading and value.