Hannah Höch, Für ein Fest gemacht (Made for a Party) 1936Whitechapel GalleryFrom its roots in European Dadaism in the early years of the twentieth century, shadowing modernism and tracing its way through photography, collage is a medium as diverse as it is politically charged. Emerging as a reaction to the First World War, collage allowed artists to interact with existing materials – anything from newsprint and magazines to maps, tickets and propaganda and photographs – to rip them apart...