At Times of Hate, Times of Joy you’ll find a quote by Roger Shattuck, from The Banquet Years, about the precursors to the Dada-ists and Surrealists:
Conventionally, a work if art is considered to be the product of a different self from the one displayed in habitual action and ordinary living. A few courageous members of the avant-garde set out to extend the artistic, creative self until it displaced all guises of habit, social behavior, virture and vice. When our entire life stems from our one deepest self, the resulting personality is usually so startling and abnormal as to appear a mask or a pose. It is the ultimate paradox of human character.
However, I can’t find a comments section at that blog, so please feel free to comment here.