 He demonstrates that no one so far has offered an irrefutable definition of perception (which does not have to mean that perception as such has to be completely unreliable). All definitions of perception are seriously flawed and we cannot rely on it in the way it is defined: we do not have even a reliable method or a dependable criterion to distinguish a genuine perception from a mirage, optical illusion or a mental image (e.g. in hallucination, reminiscence or dream). However, Iit is not the case that Jayarāśi argues that ‘there is simply no way … to know that our sense-perceptions are true’ (King 1999: 19). What he is up to is to demonstrate that, given our present definitions of perception and categories on which our epistemology rests, there is no way to determine which of our sense-perceptions are true.