Read the excerpt from Poe’s "The Fall of the House of Usher." The conditions of the sentience had been here, he imagined, fulfilled in the method of the collocation of these stones -- in the order of their arrangement, as well as in that of the many fungi which overspread them, and of the decayed trees which stood around -- above all, in the long undisturbed endurance of this arrangement, and in its reduplication in the still waters of the tarn. What is the effect of parallelism in this excerpt?