[Possible Spoilers] The Antitower's Design, from a Lore Perspective

[Mimilu]

I love the Antitower but I am curious about it from a lore perspective.

I understand that it is hanging from the ceiling of the cave it is in so that it doesn't fall into the Aetherial Sea but why is everything inside of it upside-down? Is there a purpose to this or is it just Sharlayan's love of whimsy? If so, there's a lot of physics defining magics in places to reverse gravity on things like hanging lamps and flowing water just for aesthetic... Or maybe it was built right-side-up and then placed upside-down? But then why? To get even closer to the Aetherial Sea?

Another area I question is the area after the first boss, The Lower Reaches. What is this area? We're traveling on top of upside-down platforms in a magical, swirling abyss while monsters jump out of wardrobes (or wardrobe-like portals), with furniture and debris floating around, and floating lampposts shooting at us. Is it another dimension? A part of the Void that Sharlayan jazzed up? Inside the Aetherical Sea? Inside the actual tower?