In that Venetian tracery this simplest element of sculptured form is used sparingly, as the most precious that can be employed to finish the facade. But alike in our own, and the French, central Gothic, the ball-flower is lavished on every line--and in your St. Mary's spire, and the Salisbury spire, and the towers of Notre Dame of Paris, the rich pleasantness of decoration,--indeed, their so-called 'decorative style,'--consists only in being daintily beset with stone balls. It is true the balls are modified into dim likeness of flowers; but do you trace the resemblance to the rose in their distant, which is their intended, effect? 19. But, farther, let the ball have motion; then the form it generates will be that of a cylinder. You have, perhaps, thought that pure early English architecture depended for its charm on visibility of construction. It depends for its charm altogether on the abstract harmony of groups of cylinders,[9] arbitrarily bent into moldings, and arbitrarily associated as shafts, having no _real_ relation to construction whatsoever, and a theoretical relation so subtle that none of us had seen it till Professor Willis worked it out for us. 20. And now, proceeding to analysis of higher sculpture, you may have observed the importance I have attached to the porch of San Zenone, at Verona, by making it, among your standards, the first of the group which is to illustrate the system of sculpture and architecture founded on faith in a future life. That porch, fortunately represented in the photograph, from which Plate I. has been engraved, under a clear and pleasant light, furnishes you with examples of sculpture of every kind, from the flattest incised bas-relief to solid statues, both in marble and bronze. And the two points I have been pressing upon you are conclusively exhibited here, namely,--(1) that sculpture is essentially the production of a pleasant bossiness or roundness of surface; (2) that the pleasantness of that bossy condition to the eye is irrespective of imitation on one side, and of structure on the other. [Illustration: I. PORCH OF SAN ZENONE. VERONA.] [Illustration: II. THE ARETHUSA OF SYRACUSE.] [Illustration: III. THE WARNING TO THE KINGS SAN ZENONE. VERONA.] 21. (1.) Sculpture is essentially the production of a pleasant bossiness or roundness of surface.