For many years, photographer Michael Collins had wondered what exactly it was that he found so mysterious and compelling about photography. In this series of linked pieces, Collins offers a reappraisal of photographic genres – including the humble and ubiquitous – that he believes are worthy of greater understanding. From restoring abandoned photos, whose subjects are lost to time, to a quotidian history of the studio portrait; from tracing the origins of the photographic survey within the wider field of the history of art to an experiment in portraiture using gorillas, Collins reveals what it is about photography that is so enduringly fascinating.