sentences:  Subsequent editions were published in 1991 (Bedford Arts), 2008 (Rat Hole Gallery), and 2017 (Mack).The heavily autobiographical approach of "Karasu" has its origins in Fukase's foundational photo essay, "Hyōten" [Freezing Point], of 1961, but it pushes the central themes of isolation and tragedy to new levels of depth and abstraction.Technically, the photographs of ravens were very difficult to achieve, with Fukase having to focus his camera on the small, moving black subjects in almost total darkness.