Quote
"We [the Futurists] must smash, demolish and destroy our traditional harmony, which makes us fall into a gracefullness created by timid and sentimental cubs [this denigrating word refers to the French Cubists]."
"..Is it indisputable that several aesthetic declarations of our French comrades [the Cubists in Paris] display a sort of masked academicism. It is not, indeed, a return to the Academy to declare that the subject, in painting, has a perfectly insignificant value?.. .To paint from the posing model as an absurdity, and an act of mental cowardice, even if the model be translated upon the picture in linear, spherical and cubic forms.."

Cubism is an early-20th-century avant-garde art movement which began in Paris. It revolutionized painting and the visual arts, and sparked artistic innovations in music, ballet, literature, and architecture.
"We [the Futurists] must smash, demolish and destroy our traditional harmony, which makes us fall into a gracefullness created by timid and sentimental cubs [this denigrating word refers to the French Cubists]."
"Scientific Cubism is one of the pure tendencies. It is the art of painting new compositions with elements taken not from reality as it is seen, but reality as it is known. The painters associated with this are Picasso (whose art also belongs to the other pure Cubist tendency), Georges Braque, Metzinger, Albert Gleizes, Mademoiselle Laurencin and Juan Gris ̧"
"This is the way in which the artist [in Russian Constructivism (art|Constructivism]] ] has set about the construction of the world - an activity which affects every human being and carries work beyond the frontiers of comprehension. We see how its creative path took it by way of Cubism to pure construction, but there was still no outlet to be found here."
"[the Cubist painters who].. continued to paint objects motionless, frozen, and all the static aspects of Nature; they worship the traditionalism of w:Poussin, of w:Ingres, of Corot, ageing and petrifying their art with an obstinate attachment to the past, which to our eyes remains totally incomprehensible."
"Neo-Plasticism [= De Stijl] has its roots in Cubism. It could just as easy be called the Painting of Real Abstraction. Since the abstract can be expressed by a plastic reality.. .It achieves what all painting has tried to achieve but has been able to express only in a veiled manner. By their position and their dimension as well as by the importance of given to colour, the coloured planes express in a plastic way only relations and not forms. Neo-Plasticism imparts to these relations an aesthetic balance and thereby expresses universal harmony [quote in 1921-23]."
"Already, a conscious courage is coming to life. Here are some of the painters: Picasso, Braque, Delaunay, Le Fauconnier.. ..they are highly enlightened, and do not believe in the stability of any system, even if it were to call itself classical art.. ..Their reason is poised between the pursuit of the fleeting and a mania for the eternal."