No doubt one can easily imagine, by an illusion similar to that which makes everything on the horizon appear equidistant, that all the revolutions which have hitherto occurred in painting or in music did at least shew respect for certain rules, whereas that which immediately confronts us, be it impressionism, a striving after discord, an exclusive use of the Chinese scale, cubism, futurism or what you will, differs outrageously from all that have occurred before.