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The interior of the Duomo is faced with black and white marble and has a gilded ceiling and a frescoed dome. It was largely redecorated after a fire in 1595, which destroyed most of the medieval art works.
Galileo is believed to have formulated his theory about the movement of a pendulum by watching the swinging of the incense lamp (not the present one) hanging from the ceiling of the nave. That lamp, smaller and simpler than the present one, it is now kept in the Camposanto, in the Aulla chapel.The Lizard
100 days before the high school graduation, students go and touch the two-tailed bronze lizard on the main door of the Cathedral in Piazza dei Miracoli. According to the tradition, this animal would be a sort of lucky charm for graduating students and it is so consumed that its head has completely become goldish, whereas the rest of the door is oxide-green.
The legend tells that even the other little animals on the left side of the door would be luckycharms, such as the dog and the frog.