 Particularly well-loved is the 13th century image of the "Madonna col Bambino", also called the "Madonna under the organ", attributed to Berlinghiero Berlinghieri of Volterra.The cathedral, like the leaning bell tower, is sinking perceptibly into the ground, and a few indications of this instability are visible.For example, the difference in the floor levels of the original nave of Buscheto and the bays which were added later by Rainaldo.