" With these innovations, however, the succession of reductions employed by the impressionist method is by no means exhausted. The very colours which impressionism uses alter and distort those of our everyday experience. We think, for example, of a piece of ‘white’ paper as white in every lighting, despite the coloured reflexes which it shows in ordinary daylight. In other words: the ‘remembered colour’ which we associate with an object, and which is the result of long experience and habit, displaces the concrete impression gained from immediate perception; impressionism now goes back behind the remembered, theoretically established colour to the real sensation, which is, incidentally, in no sense a spontaneous act, but represents a supremely artificial and extremely complicated psychological process. "

― Arnold Hauser , The Social History of Art: Volume 4: Naturalism, Impressionism, The Film Age