What if architecture, the discipline of gravity and permanence, could be transformed, by inversion, into the art of designing light and ephemeral structures? Over the centuries, and particularly during the 20th century, pavilions have represented an important device for experimentation. Freed from the constraints of conventional construction, intended to be admired for the time of a fair or little more, these small buildings have often been incubators of new ideas and new ways of imagining space: a pioneering vocation largely due to their ephemeral nature. This booklet, featuring a historical overview of the typology by Leonardo Lella, showcases the outcomes of a workshop led by Velia at the European Institute of Design (IED) in Rome, where the students investigated the theme of reuse, applying their insights to the design of a small pavilion in Villa Torlonia.