The transformation project of the Intercom building to accommodate the school centre meets the complicated constraints of the management of the traffic flow and of the compliance with the budget. The original expression of the architecture is preserved: visibility, legibility of the construction modes, preservation of the untreated appearance in contrast with modern interventions. The supply of fresh air and daylight in each classroom is provided by courtyards, gardens and patios in this common density of the urban centre. The plastic artist Jean Gilbert has been invited to contribute to the colours and light options for the transformation of the space.