Bernd and Hilla Becher have been working together as photographers since 1957 documenting and classifying endangered architecture - mainly industrial structures, that are now vanishing from the modern landscape. By the end of the 1960's they became part of the conceptual art movement in view of their minimalist approach. As a result their work can be found in the collections of most major art museums. For others familiar with the beginnings of industrial structures their photographic typologies represent a brilliant study of the early forms of industry. In this video they discuss their beginnings as documentarians of 19th century industrial architecture while showing us their retrospective exhibition at Berlin 's Hamburger Bahnhof Museum. Bernd Becher died in 2007.