The _practical_ question about a shape is therefore: Does it warrant the inference of a _thing_ able to change its position in three-dimensional space? to advance or recede from us? And if so in what manner? Will it, like a loose stone, fall upon us? like flame, rise towards us? like water, spread over us? Or will it change its place only if _we_ supply the necessary _locomotion?_ Briefly: is the thing of which we see the shape inert or active? And if this shape belongs to a thing possessing activity of its own, is its locomotion of that slow regular kind we call the growth and spreading of plants? Or of the sudden, wilful kind we know in animals and men? What does this shape tell us of such more formidable locomotion? Are these details of curve and colour to be interpreted into jointed limbs, can the _thing_ fling out laterally, run after us, can it catch and swallow us? Or is it such that _we_ can do thus by it? Does this shape suggest the thing's possession of desires and purposes which we can deal with? And if so, _why is it where it is?_ Whence does it come? What is it going to do? What is it _thinking_ of (if it can think)? How will it _feel_ towards us (if it can feel)? What would it say (if it could speak)? What will be its future and what may have been its past? To sum all up: What does the presence of this shape lead us to think and do and feel? Such are a few of the thoughts started by that shape and the possibility of its belonging to a thing. And even when, as we shall sometimes find, they continually return back to the shape and play round and round it in centrifugal and centripetal alternations, yet all these thoughts are excursions, however brief, from the world of definite unchanging shapes into that of various and ever varying things; interruptions, even if (as we shall later see) intensifying interruptions, of that concentrated and coordinated contemplation of shapes, with which we have hitherto dealt. And these excursions, and a great many more, from the world of shapes into that of things, are what we shall deal with, when we come to Art, under the heading of _representation_ and _suggestion,_ or, as is usually said, of _subject_ and _expression_ as opposed to _form._ CHAPTER XIII FROM THE THING TO THE SHAPE THE necessities of analysis and exposition have led us from the Shape to the Thing, from aesthetic contemplation to discursive and practical thinking. But, as the foregoing chapter itself suggests, the real order of precedence, both for the individual and the race, is inevitably the reverse, since without a primary and dominant interest in things no creatures would have survived to develop an interest in shapes.