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The idea is that the tiles and background become white when the third phase starts... And when that happens you have basically quote-unquote "entered a parallel dimension".

So it is more or less like that you don't actually go into a parallel dimension. But you get the illusion of it.

(I will eventually write a bit more about the nitty-gritty of this idea!)

Side Note:

The boss is summoned with The Idol of Emptiness.

The Idol of Emptiness is crafted with 30 sandstone bricks, 10 souls of light, 10 souls of night, and 5 hallowed bars at a mythril anvil / orichalcum anvil.

The boss can only be summoned in the desert at daytime. And it is intended to be fought after at least one mechanical boss has been defeated.

Pharasphez Bestiary Entry:

"According to legend there was once a Pharaoh who ruled over the desert sands of Terraria... It is said that this man slowly but surely began losing his sanity, and his kingdom began to descend into an Era of madness, chaos, and despair... And then one day... He suddenly disappeared without a single trace..."

The Nonexistent Kingdom Lore:

"Legends tell of an alternate reality which coexists with that of Terraria's... A blank world which can only be entered by those who have lost all of their sanity..."

-For context, read the document.

Sprite Concept: