The Garden
From The Inmara
The Garden is named after Babylon 5's central corridor, which is very similar but on a much smaller scale. Originally, the concept for it was designed for the fictional version of the Sunspot for used in role playing games and comics, but over time our inworld has come to resemble it.
There are some differences between the fictional version and our inworld version. But also, the inworld version does not map to our system members' relative locations in our brain. So, it is likely we do not actually live in the Garden, but rather meet there to interact with each other.