It is the experience of the speed of a plane, which was looking for an expression, a form and this caused the plane to come into existence. The plane was not built to take letters from Berlin to Moscow, but to give expression to the irresistible urge to create a form for the experience of speed.
As quoted in: Richtingen in de hedendaagsche schilderkunst (Trends in the Present Day Art of Painting), Jacob Bendien - W.L. & J Brusse, Rotterdam,1936, p. 100 (transl. Anne Porcelijn)