"Picabia felt.. ..that the machine had accomplished its conquest of man.. ..that his diagrams had ceased to inflame the anger of the bourgeois.. ..The Eiffel Tower whose unaesthetic carcass had offered material for so many controversies.. ..was now part of the Parisian landscape. This is why new elements appeared in the painter's work from 1919: collage, the use of solid objects, materials reputed to be non-artistic, like [the use of] Ripolin paint."