The festival Universo Assisi 2019, under the artistic direction of Joseph Grima, is a festival of culture, music, art, dance, architecture, theater, which had as its theme of the third edition of the theme of environmental sustainability, declined from the technical choices of organization to the use of non-polluting materials, the identification of locations that allow the exaltation of the beauty of Assisi landscape. With these premises and with the idea of reactivating unusual or new spaces, Universo Assisi has involved Open Design School in the creation of a Square of Architecture, which is located under the arches of the Basilica of Santa Chiara, which become in fact the "foyer of the festival". Open Design School has designed a modular, dynamic and open structure, which has lent itself in a fluid way to be a didactic space for children, a morning location for talks and side events, a setting for sound installations at night. The space has changed its skin according to its intended use, transforming itself into a true multigenerational meeting place, an iconic place to stay together and participate. The program addresses the theme of over tourism and the creation of formats suitable for all types of audiences, starting with children, and trying to design new strategies for a different narrative of the city with the virtuous and alternative use of urban spaces, reactivated for citizens, which in Assisi was achieved thanks to the modular structures in continuous evolution created by Open Design School.