The Bench
As long as we've been picturing an internal landscape there has been a bench inside our head. The bench faces the Front Window and the Projector Screen, such that there can be an audience, but the bench has also been a place for internals to sit and chat, to hold one another, to cry on one another, to lay down and rest. It serves a purpose much like the Pillows in that it's a comfortable and safe place for people to simply hang out and relax without going deep.
It's closer to Front than the pillows, so can affect "how close to Front" people are as they're interacting. There's a lot of "leakage" from folks on the Bench with someone who is Fronting i.e. there's easy interaction and influence from the Bench to Front.