The Walther Collection has kicked off an 18-month exploration of vernacular photography with a show titled The Shadow Archive: An Investigation into Vernacular Portrait Photography. Taken from the 1850s to the present day, the collected portraits depict groups such as ‘migrant laborers’, ‘inmates of an asylum’, ‘criminal photographs’, and ‘G&G Precision Works Photographic Identity Badges’, and, says the organisers, show how “identification photographs have been used to sort, shape, segregate, and select subjects based on occupation, social group, body type, or political affiliation”. The title references a phrase used by writer and photographer Allan Sekula to reference “the entire social field of human representations, comprising both heroes and deviants, within which every portrait takes its place as part of a moral hierarchy”.