In this book we will analyse the meaning of the word temporary in relation to the change between space and time, time and use, use and memory. Specifically, we will look at the value of the temporary nature of design as applied to the world, the city and its inhabitants, the temporary urban solutions (Fassi, 2012), and finally the key place designed to host people’s life: the home. Although it can be said that today the meaning of the term “living” is broader and indicates more than a place to sleep, and therefore to the small domestic space of a house. This is shown by the fact that today we live at work, we live on the go, we live in the movement, but, the house still plays a central role (Galluzzo, 2018). We will then draw up a categorization of the different types of temporary housing. Examples that in the world of design are multiple and, especially in recent years, have increased exponentially.Temporary design has become an excellent instrument to occupy peripheral, degraded and underutilized areas of the city, to give them a new personality and new value, and to then find a more permanent form of use for them. In this sense, the temporary city is one that takes its least used areas and aspects and transforms them to accommodate new uses, new identities and new inhabitants.