XLII. I have an intense love for these monochrome figures, owing to their wonderful life and spirit in all the works on which I found them; nevertheless, I believe that the excessive degree of abstraction which they imply necessitates our placing them in the rank of a progressive or imperfect art, and that a perfect building should rather be composed of the highest sculpture (organic form dominant and sub-dominant), associated with pattern colors on the flat or broad surfaces. And we find, in fact, that the cathedral of Pisa, which is a higher type than that of Lucca, exactly follows this condition, the color being put in geometrical patterns on its surfaces, and animal-forms and lovely leafage used in the sculptured cornices and pillars. And I think that the grace of the carved forms is best seen when it is thus boldly opposed to severe traceries of color, while the color itself is, as we have seen, always most piquant when it is put into sharp angular arrangements. Thus the sculpture is approved and set off by the color, and the color seen to the best advantage in its opposition both to the whiteness and the grace of the carved marble. XLIII. In the course of this and the preceding chapters, I have now separately enumerated most of the conditions of Power and Beauty, which in the outset I stated to be the grounds of the deepest impressions with which architecture could affect the human mind; but I would ask permission to recapitulate them in order to see if there be any building which I may offer as an example of the unison, in such manner as is possible, of them all. Glancing back, then, to the beginning of the third chapter, and introducing in their place the conditions incidentally determined in the two previous sections, we shall have the following list of noble characters: Considerable size, exhibited by simple terminal lines (Chap. III. § 6). Projection towards the top (§ 7). Breadth of flat surface (§ 8). Square compartments of that surface (§ 9). Varied and visible masonry (§ 11). Vigorous depth of shadow (§ 13), exhibited especially by pierced traceries (§ 18). Varied proportion in ascent (Chap. IV. § 28). Lateral symmetry (§ 28). Sculpture most delicate at the base (Chap. I. § 12). Enriched quantity of ornament at the top (§ 13). Sculpture abstract in inferior ornaments and mouldings (Chap. IV. § 31), complete in animal forms (§ 33). Both to be executed in white marble (§ 40). Vivid color introduced in flat geometrical patterns (§ 39), and obtained by the use of naturally colored stone (§ 35).