It is possible for the evocation of fear and pity to result from the spectacle, and also from the structure of events itself. The latter is preferable and is the mark of a better poet. The plot should be constructed in such a way that, even without seeing it, anyone who hears the events which occur shudders and feels pity at what happens; this how someone would react on hearing the plot of the Oedipus. Producing this effect through spectacle is less artistic, and is dependent on the production. Those who use spectacle to produce an effect which is not evocative of fear, but simply monstrous, have nothing to do with tragedy; one should not seek every pleasure from tragedy, but the one that is characteristic of it. And since the poet should produce the pleasure which comes from pity and fear, and should do so by means of imitation, clearly this must be brought about in the events.