Hobbes holds that the causes of sensations are motions that give rise to what we sense as qualities, but these qualities only have the status of 'seemings and apparitions'.

Although the account given by Hobbes of the origin and the formation of knowledge is rightly called empiricist because it traces all knowledge back to the senses or sensations and their non-sensory causes, i.e., to what he calls “things without us”, it is by no means directly committed to either idealism or dualism; on the contrary, Hobbes’s preferred ontological position is materialism. Nevertheless, his account may lead to an early form of epistemologically motivated idealism. This is so becau