The collapse of the spire was the climax of the 2019 fire. Many people thought it was medieval, but in fact the original was taken down in the 1790s because it was deemed dangerous.
Its replacement, which burned down five years ago, was put up decades later as part of a neo-Gothic reconstruction conducted by architect Eugène Viollet-Le-Duc.
This time, carpenters used a mix of the traditional and the computerised to design and build the massive wooden base.
It was lifted into place by Europe’s largest crane, then a scaffolding shell was mounted allowing workers to assemble the steadily rising structure.
Like the rest of the roof, the spire is lined with lead. At the top a new gilded cock has been fitted to replace the original that fell in the fire. It was recovered but was too damaged to go back.
Inside the new cock are holy relics including a thorn from the cathedral’s Crown of Thorns, and a parchment with the names of 2,000 people who worked on the renovation.