Excerpt: ...green alternately: but no green is ever used without an intermixture of blue pieces in the mosaic, nor any blue without a little centre of pale green; sometimes only a single piece of glass a quarter of an inch square, so subtle was the feeling for color which was thus to be satisfied. Footnote: The fact is, that no two tesserae of the glass are exactly of the same tint, the greens being all varied with blues, the blues of different depths, the reds of different clearness, so that the effect of each mass of color is full of variety, like the stippled color of a fruit piece. The intermediate circles have golden stars set on an azure ground, varied in the same manner; and the small crosses seen in the intervals are alternately blue and subdued scarlet, with two small circles of white set in the golden ground above and beneath them, each only about half an inch across (this work, remember, being on the outside of the building, and twenty feet above the eye), while the blue crosses have each a pale green centre. Of all this exquisitely mingled hue, no plate, however large or expensive, could give any adequate conception; but, if the reader will supply in imagination to the engraving what he supplies to a common woodcut of a group of flowers, the decision of the respective merits of modern and of Byzantine architecture may be allowed to rest on this fragment of St. Mark's alone. From the vine-leaves of that archivolt, though there is no direct imitation of nature in them, but on the contrary a studious subjection to architectural purpose more particularly to be noticed hereafter, we may yet receive the same kind of pleasure which we have in seeing true vine-leaves and wreathed branches traced upon golden light; its stars upon their azure ground ought to make us remember, as its builder remembered, the stars that ascend and fall in the great arch of the sky: and I believe that stars, and boughs, and leaves, and bright colors are everlastingly lovely, and...