  One may be able to accept that a veridical perception and a hallucination differ mentally, while also accepting that they have a common mental core. Mark Johnston offers an account of hallucination along these lines. He proposes that there is a respect in which the objects of hallucination and the objects of seeing are akin. According to Johnston, the objects of a subject’s hallucination are complexes of sensible qualities and relations that are not instantiated in the scene before him, whereas the objects of veridical perception are spatio-temporal particulars instantiating such complexes. On this view, there is, then, a common mental core to veridical perception and hallucination. In both cases one is aware of a ‘sensible profile’—a complex of qualities and relations.