Who judders your guts?

I also spent some quality time with this:

"You're prompted to imaginatively inhabit these heaves of paint, investing them with your own sense of body; and yet how could you? That would mean casting off all your comportment, all your muscular control: you would be skinless, virtually shapeless. To approach these images judders the guts."

C'mon. Guess, don't google. Who judders your guts?

Right here. Ouch. That hurts.