In the centre of the interior, generally entered by the door opposite the west façade of the Cathedral, stands the font in which baby Pisans have for many generations been baptized. Like others, it is made for total immersion. The walls which surround the appropriately "waved" black-and-white pattern of its floor are extremely beautiful. A delicately carved framework of marble encloses wonderful panels of inlaid mosaic somewhat in the style of the pulpit in the illustration to "Salerno." Six small basins are let into the walls of the font and are used now for the Holy Rite. Near the altar stands Niccolò Pisano's masterpiece. This hexagonal pulpit rests on seven slender columns of marble and granite. Some of these columns rise from their bases on the backs of lions, gryphons, and crouching human figures, thus in a way representing the dominion of the Word of God over creation. The rectangular panels of the pulpit stage are beautifully carved in high relief. Niccolò Pisano's art, which bears evident traces of pagan influence, is seen at its best in these panels of the Nativity, Adoration of the Magi, Presentation in the Temple, the Crucifixion, and Last Judgment. On the steps is a red marble pillar standing on the back of a lion. It supports a small marble book-rest from which the Epistle was read. The desk on the pulpit itself is placed on an eagle, and was used for the reading of the Gospel. Eight marble piers and eight granite columns support the gallery beneath the dome. The whole of this noble interior is very light and airy, and Pisan mothers should have more cause to hope for a bright future for their babes than their sisters in Parma, if a comparison is permissible between the bright cheeriness of the one place and the mystical gloom of the other.
The Campanile stands to the east of the Cathedral. Its base is some feet below the restful green of the grass that covers the whole of the Piazza. Four different architects carried out its erection during a period that extended over nearly two hundred years. The base, another blind arcade, was begun in 1174 by Bonannus; the fourth gallery was added by Benenato, the next two by William of Innsbrück, and the topmost by Tommaso. The foundations were unfortunately laid in sea-sand, and the tower settled at an angle that causes it to lean towards the south thirteen feet out of the perpendicular. Galileo utilised this feature for experiments on the velocity of falling bodies.