Because of global warming, in few decades the Rome climate is expected to be the same of Tunis. Southward explores how, then, the urban landscape would change. It does not refer to great and worst-case transformations, but to very tiny and paltry, almost minimum disturbances, slowly, but deeply, able to change the city in terms of space quality and people behaviors. The focus are the subtle substances of architecture—vague, impalpable, ethereal materials, such as the thickness of the air, the quality of shadows—and the unaware choreography of everyday life—social rituals and people habits. So, what if Rome took the place of Tunis?