The Dada movement was an anti-movement which corresponded to a need born of the first World War. Although neither literary nor pictorial in essence, Dada found its exponents in painters and writers scattered all over the world. Max Ernst's activities in Cologne in 1917 made him the foremost representative of the Dada painters. Between 1919 and 1921 his paintings, drawings and collages depicting the world of the subconscious were already a foretaste of Surrealism... In fact his previous achievements had certainly influenced, to a great extent, the literary Surrealist exploration of the subconscious.
In: 'Appreciations of other artists': Max Ernst (painter, sculptor author) 1945, by Marcel Duchamp; as quoted in Catalog, Collection of the Societé Anonyme, eds. Michel Sanouillet / Elmer Peterson, London 1975, pp. 143- 159