RobbBB, in what sense can phenomenal agony be an "illusion"? If your pain becomes so bad that abstract thought is impossible, does your agony - or the "illusion of agony" - somehow stop? The same genes, same neurotransmitters, same anatomical pathways and same behavioural responses to noxious stimuli are found in humans and the nonhuman animals in our factory-farms. A reasonable (but unproven) inference is that factory-farmed nonhumans endure misery - or the "illusion of misery" as the eliminativist puts it - as do abused human infants and toddlers.