Mental World: Not really extant, but virtually simulated, “mental worlds” are sometimes used by noeticists and sophotechnicians as fancy ways to diagram, observe, and interact with the myriad agents that make up a mind of any serious level of complexity. (Something like the Country of the Mind from Greg Bear’s Queen of Angels, et. al., if you like, although more explicitly as a metaphorical user interface.)
Wandering around in one of these, or something halfway between it and Cyberspace, is also a privilege granted to those attending a contemplationary who have been granted an audience with one of the Transcend’s high-level routines. Of course, the experience of the Mental World is a little bit different when you consider that you’re inside an entity whose thoughts are entities on the same level of complexity as all of you, or possibly rather more.
Sounds like a fabulous way to build and test models!