Morisson (2018) argues that places in the knowledge economy are evolving.[35] He argues for the existence of a fourth place. In the knowledge economy, the rise of new social environments is blurring the conventional separation between the first place (home), the second place (work), and the third place. New social environments in the knowledge city can combine elements of the first and second place (coliving); of the second and third place (coworking); and of the first and third place (comingling).[35] Furthermore, the combination of elements of the first, second, and third place in new social environments implies the emergence of a new place, the fourth place.

As the fourth place only works in the normal living mode, during COVID-19 quarantine restrictions, a new hybrid place emerged from the operation of the different outdoor and indoor typologies of other places. This place sometimes works on a physical basis, and other times virtually, with some essential characteristics needed to work properly during the pandemic outbreak. The limit of this place is the attached quarantine semi-private or semi-public space, which can be called "quarantined fourth place" or "fifth place".[36]