Because in the classical Jungian style of analysis, imagery of the basement of a childhood home was a revisiting of the past.

Likewise “up from the floor” indicates ancients coming up from caves, ancient monsters to be slain, underground dungeons. The primitive unchained and revisited.

…and using Freud’s principle of the inversion; down from the ceiling is indicative of from the future.

Prometheanism, featuring stories of Science only taking us so far before we fall from the ceiling, or rather it chaotically falls on us.

The idea that a return to primative barbarism and violence can also come from above, from technology, from the future unknown, from advanced beings, complex plans, or outter space.

So whether it’s up from the floor (ancient past) or down from the ceiling (unknown future) - it’s coming for us, with risks and dangers we’re not ready for…

…or so the stories go.