In two days, Notre-Dame Cathedral will reopen its doors. What would a cathedral be without its bells? Those which were damaged by the fire were restored and re-patinated by the craftsmen of the famous Cornille Havard foundry, in Normandy. To accommodate these bells in the cathedral, the wooden structure which supported them had to be partly rebuilt, because it had burned. At the request of the Archbishop of Paris, Mgr Laurent Ulrich, the 21 bells of Notre-Dame will ring out this Saturday, December 7 at 6:30 p.m. A bell is a foundry piece, a musical instrument and a symbolic object, the manufacture of which involves several trades.