Design based on change could refer to the reuse of spaces. Spaces could be exploited in different ways to accommodate various functions, and this is considered sustainable as there are no new structures created or existing ones demolished. Instead, new meanings are given to them, thanks to flexible temporary systems that allow composing several configurations inside different spaces. It is interesting how many features of a versatile system are also typical of emergency structures built to succumb to natural disasters, war situations, or pandemics. The emergency has some universal generalities, in particular the need for immediate intervention, which requires a pragmatic project. Maybe, in the future, these features might be considered as one of the prerequisites of versatile systems.