All through that scene; again, in the scene where Cassio is attacked and Roderigo murdered; everywhere where Iago is in physical action, we catch this sound of almost feverish enjoyment. His blood, usually so cold and slow, is racing through his veins. But Iago, finally, is not simply a man of action; he is an artist. His action is a plot, the intricate plot of a drama, and in the conception and execution of it he experiences the tension and the joy of artistic creation. 'He is,' says Hazlitt, 'an amateur of tragedy in real life; and, instead of employing his invention on imaginary characters or long-forgotten incidents, he takes the bolder and more dangerous course of getting up his plot at home, casts the principal parts among his newest friends and connections, and rehearses it in downright earnest, with steady nerves and unabated resolution.' Mr. Swinburne lays even greater stress on this aspect of Iago's character, and even declares that 'the very subtlest and strongest component of his complex nature' is 'the instinct of what Mr. Carlyle would call an inarticulate poet.' And those to whom this idea is unfamiliar, and who may suspect it at first sight of being fanciful, will find, if they examine the play in the light of Mr. Swinburne's exposition, that it rests on a true and deep perception, will stand scrutiny, and might easily be illustrated. They may observe, to take only one point, the curious analogy between the early stages of dramatic composition and those soliloquies in which Iago broods over his plot, drawing at first only an outline, puzzled how to fix more than the main idea, and gradually seeing it develop and clarify as he works upon it or lets it work. Here at any rate Shakespeare put a good deal of himself into Iago. But the tragedian in real life was not the equal of the tragic poet. His psychology, as we shall see, was at fault at a critical point, as Shakespeare's never was. And so his catastrophe came out wrong, and his piece was ruined.