Bernd and Hilla Becher were German photographers who graduated from Kunstakademie in Düsseldorf, this art school was notorious for teaching an objective style of photography. Bernd and Hilla were no exception as they began to document disappearing German industrial architecture, photographic thousands of objects such as gas tanks and water towers. They would constantly compare the photos to show slight changes between objects. They shot only on overcast days, to avoid shadows, and early in the morning during the seasons of spring and fall they did this so they could keep a consistent comparison between objects. The Bechers also photographed outside Germany, including from 1965 buildings in Great Britain, France, Belgium and later in the United States. In 1966, they undertook a six-month journey through England and south Wales, taking hundreds of photographs of the coal industry around Liverpool, Manchester, Sheffield, Nottingham and the Rhondda Valley.