Does Earth plug a hole in Heaven, or Heaven plug a hole in Earth?
Origin's collision affixes itself central in Nia's landscape of thoughts, whether or not she'd prefer it to. Like coursework left aside for months, even after you've bloody well graduated, it inhabits her mind as though it were born there.
The two massive components united in skew space, along multiple dimensions - rather, axes - of travel. Not side-to-side, nor top-to-bottom.
But if she is the cat, and her lovely Melia the peacedove bird, then certainly, she will posit that Alrest were the base, and the Bionis-Mechonis world the slot inward from above, even as she wears airy angels' white opposite grief-stricken flock.