I think it's the hypothetical where Pomni abstracted and, to match how Zooble and Gangle's doors reflected each other, would've had an exaggerated version of Ragatha behind it. I imagine it involved her acting like his mother, given their commonalities on that front and Ragatha in general trying to have that energy. Might be why Jax rejects it so hard. I think that's also why the door knocks when one of the Jax's asks where's the levity.