DarkSaint85
Bonified abstract
So I think it's a bit more nuanced then yes/no.
Pariah created these dream worlds to trap the JL. Now, can we assert physical size/properties to them? It would make a poor trap for the Flash, for example, if he runs out of 'world' in 2 seconds, or if it is such a shitty facsimile that Batman works out in 2 minutes that it's fake - IOW, it has to be a pretty damn good copy to fool them.
At the same time, they're just dark energy crisis bombs or whatever. Held together by the JL's individual imagination and mental power.
So yes, they're *worlds*. But anyone can destroy them once they became unstable (like in Batman's world). Pariah even wanted that to happen, as it then released the dark energy.