Headspace
The projected realm inside the mind, where individual headmates may be able to interact with each other and even potentially carry out a day-to-day life separate from the world outside the system’s body (i.e. “real world”).

This phenomena occurs when there is a system of personalities operating within the mind/brain/body. This is often called a multiplicity or Multiple Systems

A multiplicity is a state in which many people share one physical body. Being multiple means that one exists as part of a group of people, with all the benefits and drawbacks and chances for talents or interesting natures that any other group of people would have.

It is not automatically a disorder, and it is not automatically something which must be changed in order to promote mental or physical health. It is not automatic godhood, proof of genius status, or even proof of severe sexual trauma
Don't mind us we are just redecorating our headspace