Its a fictional space, spoken in descriptive form by a computer running Headspace: OS. And more!
What does Headspace contain? The answer is ...
Mind-matter possesses near limitless potential. We may limit certain qualities into quantity to help define it. For instance, a single prim of mind-matter, say in a ball shape, can be infinitely large or infinitely small, or somewhere in between. It can float, fly faster than light, bounce, and melt through walls. Curious properties indeed. It can cleave, its can combine, and it can disappear. Mind-matter can live, evolve, and breathe. It can be animated, lifeless, or even invisible.
Headspace is the virtual reality imagery in your mind. A computer may remind you where you are and help guide you through your own headspace and those of others.