You suspect that I am “pushing the claims of the Imagination so far as to deprive the Reason or Understanding[3] of its rights;” and you ask me whether I dispute the universal belief that the former is an “illusive faculty.” As for your suspicion, I will endeavour to show that it is groundless. As for your question, I admit that the Imagination is “illusive,” but I must add that it also leads us to truth. It constructs the hypotheses, as well as the illusions, which, when tested by experience, guide us towards Knowledge. Imagination is the “imaging” faculty of the mind. It does not, strictly speaking, create, any more than an artist, strictly speaking, creates. But as an artist combines lines, colours, shades, sounds, and thoughts, each one of which by itself is familiar to everybody, in such new combinations as to produce effects that impress us all as original and unprecedented, so does the Imagination out of old fragments make new existences and unities. Attention impresses upon us the present; Memory recalls the past; but the Imagination is never content simply to reproduce the past or present. It sums up the past of Memory (sometimes perhaps also the present of Attention) and combines it with a conjectured future in such a way as to produce a whole. It is always seeking for likenesses, orderly connections, regular sequences, beautiful relations, suggestions of unity in some shape or other, so as to reduce many things into one and to obtain a satisfying picture. For example, suppose a large mill-wheel at rest to be almost hidden from my eyes by intervening trees so that, even if it were moving, I could only see one spoke at a time; and at present I am not aware that it is close before me. Something begins to move. I look up. Attention tells me that I see before me, moving from left to right, something like a plank or pole: it passes and I see nothing; but then comes another similar object moving similarly; then a third, rather quicker; then a fourth, quicker still. The mind at once sets to work to find the cause. The Memory tells me that I have seen simply a number of poles or planks moving from left to right with quickened motion; the Attention tells me that I see one now; but the Imagination, taking in the isolated reports of Memory and Attention, includes them in a larger hypothesis of her own, in which, if I may so express it, the constituent elements, the spokes, are subordinated, and the explanatory unity, the wheel, is brought into prominence; and thus the motion from left to right, which explained nothing, is replaced, in my mind, by the motion of revolution, which explains everything.