Technical assistance to the MOE in the study of interim relocation of the Orly control tower watchman to the IFR room, located on the floor below. Creation of a prototype for 2 façade modules in the occupied site. Summary Reflection was needed in order to carry out the façade modification solely from the interior, all the while guaranteeing maximum visibility for the controllers. The glass elements are cut in half to make them more easily transported, but only a thin silicone joint separates them. Interventions must be carried out between 12:00 et 4:30 A.M. and the front control tower must once again be operational when the airport opens.