"Nuit et Brouillard" ("Night and Fog", 1956) was one of the first documentaries about the Nazi concentration camps, but it deals more with the memory of the camps than with their actual past existence. Realising that standard documentary techniques would be incapable of confronting the enormity of the horror (and even risked humanising it), Resnais chose to use a distancing technique by alternating historical black-and-white images of the camps with contemporary colour footage of the sites in long tracking shots. The accompanying narration (written by Jean Cayrol, himself a survivor of the camps) was intentionally understated to add to the distancing effect. Although the film encountered censorship problems with the French government, its impact was immense and it remains one of the director's most admired works.