This project forms part of the framework of the Grand Paris Express macro-project, comprising the creation of new lines on the Paris Metro and the lengthening of existing lines.

This project is more specifically focused on the creation of the new Rosny-Bois-Perrier station on the newly extended Line 11 of the Paris Metro.

The new station's roof will feature two lightwells created from three-layered ETFE cushions which will provide lots of light while ensuring the roof is perfectly sealed. The first well takes the shape of a trapezoid and is made up of seven cushions arranged on arches and which cover a surface area of 10.9m wide by between 13.8m and 16.5m long. The second well has a rectangular shape and is made up of six cushions, also arranged on arches, which cover a surface area of 10.9m wide by 11m long.

This configuration featuring two lightwells covers a total area of 280m².