Members of the Wandervogel from Berlin, black-and-white photograph, undated [c. 1930], photographer unknown; source: Deutsches Bundesarchiv (German Federal Archive), picture 183-R24553, wikimedia commons, http://commons.wikimedia.org/wiki/File:Bundesarchiv_Bild_183-R24553,_Gruppe_des_Wandervogels_aus_Berlin.jpg