aesthetics must be based on personal experience--that is to say, they must be subjective. Yet, though all aesthetic theories must be based on aesthetic judgments, and ultimately all aesthetic judgments must be matters of personal taste, it would be rash to assert that no theory of aesthetics can have general validity. For, though A, B, C, D are the works that move me, and A, D, E, F the works that move you, it may well be that _x_ is the only quality believed by either of us to be common to all the works in his list. We may all agree about aesthetics, and yet differ about particular works of art. We may differ as to the presence or absence of the quality _x_. My immediate object will be to show that significant form is the only quality common and peculiar to all the works of visual art that move me; and I will ask those whose aesthetic experience does not tally with mine to see whether this quality is not also, in their judgment, common to all works that move them, and whether they can discover any other quality of which the same can be said. Also at this point a query arises, irrelevant indeed, but hardly to be suppressed: "Why are we so profoundly moved by forms related in a particular way?" The question is extremely interesting, but irrelevant to aesthetics. In pure aesthetics we have only to consider our emotion and its object: for the purposes of aesthetics we have no right, neither is there any necessity, to pry behind the object into the state of mind of him who made it. Later, I shall attempt to answer the question; for by so doing I may be able to develop my theory of the relation of art to life. I shall not, however, be under the delusion that I am rounding off my theory of aesthetics. For a discussion of aesthetics, it need be agreed only that forms arranged and combined according to certain unknown and mysterious laws do move us in a particular way, and that it is the business of an artist so to combine and arrange them that they shall move us. These moving combinations and arrangements I have called, for the sake of convenience and for a reason that will appear later, "Significant Form." A third interruption has to be met. "Are you forgetting about colour?" someone inquires. Certainly not; my term "significant form" included combinations of lines and of colours. The distinction between form and colour is an unreal one; you cannot conceive a colourless line or a colourless space; neither can you conceive a formless relation of colours. In a black and white drawing the spaces are all white and all are bounded by black lines; in most oil paintings the spaces are multi-coloured and so are the boundaries; you cannot imagine a boundary line without any content, or a content without a boundary line. Therefore, when I speak of significant form, I mean a combination of lines and colours (counting white and black as colours) that moves me aesthetically.