Eren be like

Kinda answered the question with the statement. The thing doing the controlling has a preference for how things look.

We’re just apes that discovered math and invented a social order, then drove ourselves insane with them

Damn girl you think with that prefrontal cortex?

Or, as someone put it: we are brains piloting bone mechs with muscle armor

Because I know we’re all thinking it, here are the brains from Jimmy Neutron.

What if the gut biome is secretly controlling the brain? What then, huh?

ONLY I HAVE THE BRAINS TO RULE LYLAT!

I think this Fairly Odd Parents episode put it very clear.

We are wet computers

The nerve of this guy

Hmmm, when you get down to it, we look like the flying spaghetti monster. Guess we are made in his image.

I mean for hundreds of years we thought brains of black people were physically structured differently. Humanity has been guessing at what’s right and has been critically incorrect through out most of history.

And even then, it’s only a part of it that consciously controls the body and makes decision.

Correction: we are those things piloting the fleshbag.