The best examples of the richer kinds of shafts are seen frequently in Italian Gothic buildings and monuments south of the Apennines. Such, for instance, as those which, with rich iron work between them, form the screen round the altar under the “crossing” of Sta. Chiara at Assisi, or in the monument of Pope Benedict X. at Perugia, where the shafts are of white marble, the spiral lines formed with a bead and fillets, and at the base and neck of the shaft the beads are all connected together with small arches, in the spandrels of which vine leaves are delicately carved; whilst to add to the extraordinary richness of the work, small figures are carved in the marble creeping round the shaft in the hollow formed by the spiral construction, and the spaces between the mouldings are filled in with glass mosaic patterns in red, green, and blue on a gold ground. The shafts of Orcagna’s shrine in Or’ San Michele, Florence, are of the same character, but these extraordinary decorations occur generally only in the best and richest internal work, executed under the direct influence of Florentine, Neapolitan, or Roman artists.[83] The arrangement of spiral shafts was generally, but not always, symmetrical. In the Campanile of Florence, where they occur in pairs on each side of a window, they are always arranged with the spiral lines curving in opposite directions. In the porch of Sta. Maria Maggiore, Bergamo, the three shafts in each jamb are all different: the first spiral and carved, but not moulded; the second moulded with chevrons; the third spiral and moulded only, and the central shaft is red whilst the others are all white. In the spirally designed string-courses of the Venetian palaces the spiral lines are always worked in opposite directions right and left of the centre.