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The restauration of the burnt down parts of the cathedral will be most probably based on their detailed description by art experts, architects and writers, in particular, by Victor Hugo in his novel Notre-Dame de Paris.
Some parts of the cathedral may be restored with the help of photographs and videos shot by the custodians and the visitors of the cathedral in the years preceding the fire.
In addition, at least two digital copies of the cathedral that reproduce the finest details of the structure exist today.