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, … - Piet Mondrian

It may be noted that in Neo-Plastic art the crucial thing is the right angel, that is, the right-angle lines. And not whether the position of the lines is vertical or horizontal.. .So it is possible to make very beautiful things while placing the lines in a diagonal position.

Only now I become conscious that my work in black, white and little color planes has been merely 'drawing' in oil color. In drawing, the lines are the principal means of expressions.. .In painting, however, the lines are absorbed by the color planes; but the limitations of the planes show themselves as lines and conserve their great value.

Though I do, of course agree with the principles you have mentioned, I am returning the paper unsigned, as I do not want to belong to a group. A group of people with one aim is not as yet a single-minded group and as this does not exist, a consistent group remains impossible. And a larger group only makes sense for joint exhibitions and for spreading ideas. I will therefore not participate in the other group either, but I have promised my collaboration in this respect. If you definitely want to form a group, you can always invite myself and others who are proved to be suitable. Only on such a basis I will collaborate with the other group as well.