Light in nature creates movement in color. The movement is provided by the relationships of uneven measures, of colors contrasts among themselves and constitutes Reality [In his quote Delaunay is referring to his series 'Window'-paintings', which he had started in 1912].
In: 'Nous irons jusqu'au soleil', Delaunay; Quoted in 'Futurism', ed. By Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 217