For – to say a few words on technique – whereas the curved line was used predominantly for reasons of beauty, (Phidias, Michelangelo, Raphael, Rubens… - Theo van Doesburg

Perhaps it was his return to Paris [In June 1919 Piet Mondrian returned to Paris] that was needed to provide him with fresh new possibilities in his work. Invigoration. His most recent work is without composition. The division of the picture plane is modular. That means ordinary rectangles, all the same size. The only contrast is in the colour. In my view, this runs counter to his theory concerning the abolition of position and dimension. This is in effect equality of position and dimension.

Gradually we began [ De Stijl-artists in The Netherlands, 1918] to present a closed front. By working there had been created not only a clarity in the collective consciousness of our group, but we had gained a certainty, which made it possible for us to define our collective attitude towards life and to perpetrate it according to the requirements of the period.. .As the world war [ World War I ] was coming to an end, we all came to feel the need of securing an interest in our efforts beyond the narrow boundaries of Holland.

Dada is able to mobilize the optical and dimensional static viewpoint which keeps us imprisoned in our [three-dimensional] illusions. Thus it became possible to perceive the entire prism of the world instead of just one facet at a time. In this connection Dada is one of the strongest manifestations of the fourth dimension, transposed onto the subject.. ..Dada is 'yes-no', a bird on four legs, a ladder without steps, a square without angels. Dada possesses as many positives as negatives. To think that Dada simply means destruction is to misunderstand life, of which Dada is the expression.