French contemporary artist Jean Rene (a.k.a. JR) on Friday put the final touches to a huge collage in the courtyard of the Louvre, his latest eye-popping-project unveiled to mark the 30th birthday of the Louvre’s glass pyramid.

Some 400 volunteers working in teams of 50 spent four days pasting strips of printed paper on the cobbles of the courtyard, creating a giant patchwork around the pyramid commissioned by late Socialist president Francois Mitterrand.

JR, who has been dubbed the “French Banksy” after the British street artist, is famous for blowing up photographs, often of people, into huge collages that have graced the wall between Jerusalem and the West Bank and the Rio favelas, among other sites.

The artist promised that his latest work — created using a technique that distorts the image of the subject unless viewed from a specific angle — would reveal “the Secret of the Great Pyramid.”

A camera on the roof of the Louvre fed images to two giant screens which appeared to show the pyramid emerging from its foundations, as if from a giant quarry of white rock.

“There are more than 2,000 strips to paste on the ground, each ten meters long, so it’s a huge puzzle. And when you’re on the puzzle you don’t see what you’re doing,” the artist told AFP.

“It’s great. We’re like children watching this pyramid grow before our eyes.”

Hated by many Parisians when it was unveiled 30 years ago on Friday, Chinese-American architect I. M. Pei’s creation has wormed its way into their hearts and is now revered like one of the Louvre’s greatest treasures, such as the “Mona Lisa” and the “Venus de Milo.”

Three years ago, JR gave the pyramid a very different treatment, covering it in a giant trompe-l’oeil that made it look as if it had disappeared.