Which indeed it is; and travellers are always greatly amused at being allowed to ring this bell; but it never occurs to them to ask how it came to be ringable: -- how that tintinnabulate roof differs from the dome of the Pantheon, expands into the dome of Florence, or declines into the whispering gallery of St. Paul's.    From Wordnik.com.  [Val d'Arno] Reference

When you have had full satisfaction of the tintinnabulate roof, you are led by the sacristan and Murray to Niccola Pisano's pulpit; which, if you have spare time to examine it, you find to have six sides, to be decorated with tablets of sculpture, like the sides of the sarcophagus, and to be sustained on seven pillars, three of which are themselves carried on the backs of as many animals.    From Wordnik.com.  [Val d'Arno] Reference