"QC-like”: Refers to the Q Continuum of Star Trek. When lesser beings visit it, they are unable to comprehend its true nature, so they see it as a metaphor using something with which they’re familiar (such as a way- station on an abandoned highway or a battle site of the American Civil War). The End of Time and The Bend of Time may work like this, too. The rooms and ornaments travelers see probably don’t actually exist there, but are created by the travelers’ minds as a metaphor for their convenience."
— GameFAQs: Chrono Trigger (SNES) Extratemporal Locations FAQ by Leebot Whoaaaa. Edit: This quote is just a fan’s speculation but I like the concept.