Multispace exists at the intersection of the physical and digital, and in the blurring of their previously clear diving lines. Multispace is not a single space, but a hybrid space where, in effect, we occupy multiple spaces simultaneously. We enter it on a Zoom call, when we are un our office and in a meeting with 20 people; when we are cycling down a country lane whilst racing against thousands of others who also use the Strava app; when we are watching a Tv show while live tweeting; or, perhaps most literally, when wandering around the local park looking for creatures that only appear on a smartphone screen. A fundamental question of this AD is why the phenomena that multispace describes are of concern to architects. the answer is that multispace points to a situation that is at root an architectural one. Offering both a collective and highly personalised experience, static and dynamically customisable, and above all at the same time public and private, multispace lies at the centre of the complex set of tensions, concerns and preoccupations that define how we conceive architecture as theory and practice. It is the messy space in between, with rough and uneven edged that are constantly shifting.