You know, the creators really didn't have to go the extra mile by incorporating the squishing and squelching flesh sound effects during an already loud, noisy scene, but they still did... I respect that.

From the 3rd journal:”ONCE HE GAINS PHYSICAL FORM ALL IS LOST”

I like how Bill cipher went through this transformation and was like "Nah I'll be normal me, it's iconic and comprehensible".

Blue dots go onto the Bill.

that muscle going onto him is scary ;-;

Ma, get the chainsaws and flamethrowers! It's the triangle man again!

Physical form, don't mind if I DO!!!

Gravity falls: A kids show!

Something's oddly satisfying about all of this.

Physical form = pyramid

Ya know......... for kids.

0:08 look it's a meat Dorito

0:08-0:12 When you turn 13 and all of your internet restrictions get removed:

HAHAHAHA IT'S FINALLY HAPPENING !!!!

If he gains physical form then all is lost

I just imagined king from the owl house having one of his days again

Bill:(laughs) oh it's happening it's finally finally happening (laughs) physical form don't mind if i do (triangle in the sky)

weird obscure fighting game character mains when their main finally gets buffed

I wonder if him growing muscles is a 3d version of what mcgucket saw since he apparently saw "Bill Cipher removing his exoskeleton to eat something". So could jt be that the yellow is his exoskeleton and the muscle mass seen here is under his yellow shell?