the force of paracosms, fantasy worlds
https://en.wikipedia.org/wiki/Paracosm
https://www.reddit.com/r/paracosms/
https://when-then-zen.christine.website/skills/paracosm-immersion
https://deborahbiancotti.net/2011/10/blog-briefs-on-burnout-with-steph-swainston/
Suzanne Britton about 'Worlds Apart'; "For over 20 years, I have dreamed about an alternate universe I call The Higher World. For the last three of those years, I've poured almost all of my creative energy into a novel-length story set in that universe." http://ironphoenix.org/worlds/