There’s something wrong with that bubble though. When Bill first makes it, Mabel is surrounded in a flawless, perfect prison but he wraps it in chains.
You don’t create a cage and wrap it in chains to keep things out, you do it to keep things in.
Not only that though, it looks like the bubble is cracking and Bill has added more chains as well as put the bubble where he can see it from the pyramid.
The purple is all Bill’s bubble but the pink glow is coming from Mabel in that first picture. So why are there cracks? Why are the lines so jagged now?
And why are Bill’s friends so afraid of someone messing with it?
8-Ball knows her by name. They call her “Mabel”, not shooting star, not that “kid” but Mabel even though the shooting star is stamped across the front so the whole world can see.
They’re worried about Dipper (who they do call “Pine Tree”) messing with “her bubble”.
Gideon is tasked to protect it and Bill has so much faith that Gideon’s obsession with Mabel will never turn his “warden” against him (another bit of evidence of how human emotions will be Bill’s downfall).
The people of Gravity Falls can see it from their town and Mabel is displayed like a trophy. Villains only do this to their greatest adversaries but Bill doesn’t care about Dipper. 8-Ball and Teeth are told they can eat him.
The Shooting Star even looks like it’s been patched together by something, but why? Why does the bubble look like it’s breaking?
What if the chains are the only thing keeping the bubble together? What if something from the inside is trying to break free and the bubble is expanding and cracking like something about to burst because of that?
Mabel’s imagination is infinite. There’s nothing on the planet that contain it.
Not even Bill.
And, by the way he’s acting, she’s his worst nightmare.
