"'To abstract' something implies one of those mental activities (in contrast to emotional spontaneity) through which certain [aesthetic] values are isolated from the world of reality. However, when such values were realized visually and applied as purely constructive means, they became real. Thus the abstract was transformed into the real, thereby illustrating the relativity of the former term.. .The period of abstraction is at an end. Is not an elementary painting, which is to say a certain composition of plane-linear colours, organic in itself, more concrete?"