invent them; for how else are we to explain the fact that not only do the artists of a particular period affect particular kinds of form, but that even the spectators of each new generation seem to be born with sensibilities specially apt to be flattered by them. In this age it is possible to take refuge under the magic word "Cezanne"; we can say that Cezanne has imposed his forms on Georgian painters and public, just as Wagner imposed his on Edwardian musicians and concert-goers. This explanation seems to me inadequate; and in any case it will not account for the predominance of formal fashions in ages undominated by any masterful genius. The spirit of an artistic age is, I suspect, a composition that defies complete analysis; the work of one great mind is generally one part of it, the monuments of some particular past age are often another. Technical discoveries have sometimes led to artistic changes. For instance, to men who have been in the habit of painting on wood, the invention of canvas would suggest all sorts of fascinating novelties. Lastly, there is a continual change in the appearance of those familiar objects which are the raw material of most visual artists. So, though the essential quality--significance--is constant, in the choice of forms there is perpetual change; and these changes seem to move in long flights or shorter jumps, so that we are able, with some precision, to lay our fingers on two points between which there is a certain amount of art possessing certain common characteristics. That which lies between two such points historians call a period or movement. The period in which we find ourselves in the year 1913 begins with the maturity of Cezanne (about 1885). It therefore overlaps the Impressionist movement, which certainly had life in it till the end of the nineteenth century. Whether Post-Impressionism will peter out as Impressionism has done, or whether it is the first flowering of a new artistic vitality with centuries of development before it, is, I have admitted, a matter of conjecture. What seems to me certain is that those who shall be able to contemplate our age as something complete, as a period in the history of art, will not so much as know of the existence of the artisans still amongst us who create illusions and chaffer and quarrel in the tradition of the Victorians. When they think of the early twentieth-century painters they will think only of the artists who tried to create form--the artisans who tried to create illusions will be forgotten. They will think of the men who looked to the present, not of those who looked to the past; and, therefore, it is of them alone that I shall think when I attempt to describe the contemporary movement.[25]