The new architecture has 'opened' the walls so that the separateness of interior and exterior is suppressed. Walls no longer sustain since the system… - Theo van Doesburg

We speak of concrete and not abstract painting because nothing is more concrete, more real than a line, a colour, a surface. [quote of Van Doesburg, c. 1925]

In addition, 'Elementarism' is real instead of abstract. The use of the term 'abstract' also caused much misunderstanding. This is easily explained.. .As used in connection with visual methods of expression, the term 'abstract' is extremely relative. '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. Hence, the term ‘abstract-real’ [proposed by his former artist-fellow Piet Mondrian,] was a fortunate invention, although in reference to a new orientation [van Doesburg's new art orientation 'Elementarism'] the term 'real' is sufficient. 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...

White
This is the spiritual colour of our times, the clearness which directs all our actions. It is neither grey nor ivory white, but pure white.
White This is the colour of modern times, the colour which dissipates a whole era; our era is one of perfection, purity and certitude.
White It includes everything. We have superseded both the 'brown' of decadence and classicism and the 'blue' of divisionism, the cult of the blue sky, the gods with green beards and the spectrum.
White pure white...