With regard to the diagonal, too, I am in complete agreement with you [with Theo van Doesburg ]. As soon as it appears together with straight [horizo… - Piet Mondrian

I believe that new art must differ totally in its manifestation from art as we know it, and people may be very reluctant to accept this. It is perhaps true to say, as someone did of cubism, that 'To sum up: since art is a need to create rather than imitate, the 'cubists' rousing themselves from the sentimentality born of the picturesque aspect of some natural spectacle or other, disengage the fleeting aspects from those which are constant and absolute, and with the aid of these two elements, construct a reality equivalent to that which they see before them'. Thus it is a question of finding the true equivalence (that, offered by Cubism is still not true equivalence), and this can only be 'that which is not nature at all, and is nonetheless one with nature [like in Neo-Plasticism / De Stijl ].

For the present at least I shall restrict my work to the ordinary world of the senses, since that is the world in which we still live. But nevertheless art even now form a transition to the finer regions, which perhaps I am incorrect in calling spiritual, for everything that has form is not yet spiritual, as I read somewhere. But it is nonetheless the path of ascension away from matter. Well dear Querido, with many heartfelt wishes, Piet Mondriaan.

As you can see this is a composition of vertical and horizontal lines which will (in an abstract manner) have to express the idea of rising upwards, of magnitude. This is the same idea which used, for example, to be the guiding principle in the construction of cathedrals. Since only the manner of expression and not the representation has to express this general idea, I have not given any title. An abstract human mind will, of itself, receive the intended impression. I always confine myself to expressing the general.