It's not fiction if you believe it: How imaginary worlds are derived from imaginary realities
Imaginary worlds are not a consequence of humans' exploratory tendencies as argued in the target article but a recent spinoff of a strong human tendency to create imaginary realities, that is, versions of how the world works that are fabricated (although we believe they are real) in order to allow us to believe we understand it and can control it.
Behavioral and Brain Sciences
imaginary worlds, imaginary realities
Arnett, Jeffrey Jensen, "It's not fiction if you believe it: How imaginary worlds are derived from imaginary realities" (2022). Psychology. 683.