It must be emphasized that in seeing a work of art that has been composed by precise means, the viewer does not perceive dominant details. His impres… - Theo van Doesburg

Marinetti's [leading Futurism founder and theorist] Tactilism can be seen as an instinctive effort in this direction [of the new architecture, according to Van Doesburg] even if it presents only the sensuous-tactile expression of space through using various materials. Picasso's earlier compositions in various materials also concerns us here. The Russian artists [ Tatlin and Lissitzky, both Constructivist artists] also appreciated the exterior quality of the plane, not only optical, but also in a tactile manner.. .Intuition already produced a foreknowledge of these new realms, but they can be established fully only by science.

[ Futurism's] ..superficial expression of velocity, the aeroplane, the racing-car and so on, is but a weak expression of the inner velocity of thought compared to which the velocity of radium represents nothing but inertia.. .The mimetic expression of velocity (whatever its form may be: the aeroplane, the automobile, and so on) is diametrically opposed to the character of painting, the supreme origin of which is to be found in inner life.

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]