arguments from I+H against idealism

main aim

to argue that idealism cannot account for illusions and hallucinations

premise one

we sometimes experience illusions and hallucinations in which properties and objects that are not real exist in our perception

premise two

idealism states that all things that are perceived, exist, and are the only things that exist

conclusion one

so, for an idealist, illusions and hallucination are impossible

conclusion two

but we know they are possible, so idealism is false

development

idealism is a direct theory of perception, it says the immediate objects of perception are things that exist

this means that if we perceive things a certain way, then that means things really are that way, in some sense

this clashes with our understanding of illusions and hallucinations and all cases of non-veridical perception