And the same object appears straight when looked at out of the water, and crooked when in the water; and the concave becomes convex, owing to the illusion about colours to which the sight is liable. Thus every sort of confusion is revealed within us; and this is that weakness of the human mind on which the art of conjuring and of deceiving by light and shadow and other ingenious devices imposes, having an effect upon us like magic. True. And the arts of measuring and numbering and weighing come to the rescue of the human understanding-there is the beauty of them--and the apparent greater or less, or more or heavier, no longer have the mastery over us, but give way before calculation and measure and weight? Most true. And this, surely, must be the work of the calculating and rational principle in the soul To be sure. And when this principle measures and certifies that some things are equal, or that some are greater or less than others, there occurs an apparent contradiction? True. But were we not saying that such a contradiction is the same faculty cannot have contrary opinions at the same time about the same thing? Very true. Then that part of the soul which has an opinion contrary to measure is not the same with that which has an opinion in accordance with measure? True. And the better part of the soul is likely to be that which trusts to measure and calculation? Certainly. And that which is opposed to them is one of the inferior principles of the soul? No doubt. This was the conclusion at which I was seeking to arrive when I said that painting or drawing, and imitation in general, when doing their own proper work, are far removed from truth, and the companions and friends and associates of a principle within us which is equally removed from reason, and that they have no true or healthy aim. Exactly. The imitative art is an inferior who marries an inferior, and has inferior offspring. Very true. And is this confined to the sight only, or does it extend to the hearing also, relating in fact to what we term poetry? Probably the same would be true of poetry. Do not rely, I said, on a probability derived from the analogy of painting; but let us examine further and see whether the faculty with which poetical imitation is concerned is good or bad. By all means. We may state the question thus:--Imitation imitates the actions of men, whether voluntary or involuntary, on which, as they imagine, a good or bad result has ensued, and they rejoice or sorrow accordingly. Is there anything more? No, there is nothing else.