[An artist must apply] his personal faculties to the ideas and the events of the times in which he lives.. .[A]rt in painting should consist only of the representation of things which that are visible and tangible to the artist. Every age should be represented only by its own artists, that is to say, by the artist who have lived in it. I also maintain that painting is an essentially concrete art form and can exist only of the representation of both real and existing things.. .An abstract object, not visible, nonexistent, is not within the domain of painting.