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.
Letter to Theo van Doesburg, Amsterdam, 1915; as quoted in Letters of the great artists, Richard Friedenthal, Thames and Hudson, London, 1963, p. 234 (transl. Daphne Woodward)