Dada or Dadaism is a cultural movement that began in Europe during World War I and peaked form 1916 to 1920. It concentrated its anti-war politic through a rejection of prevailing standards in art through anti-art cultural works. It was not art - it was anti-art. Dada strove to have no meaning. The interpretation of Dada is dependent entirely on the viewer. 'I have adopted this in much of my current work, encouraging the viewer to interpret the art and not be restricted to object recognition'.
Like those involved in Dada, adherents of Surrealism thought that the horrors of World War I were the culmination of the Industrial Revolution and the result of the rational mind. Consequently, irrational thought and dream-states were seen as the natural antidote to those social problems. It is through the practice of automatism, dream interpretation, and numerous other surrealist methods that Surrealists believe the wellspring of imagination and creativity can be accessed. *Referenced from Wikipedia Encyclopedia