  At 157c–160c Socrates states a first objection to the flux theory. This asks how the flux theorist is to distinguish false (deceptive) appearances such as dreams from the true (undeceptive) appearances of the waking world. The flux theorist’s answer is that such appearances should not be described as ‘true’ and ‘false’ appearances to the same person. Rather they should be described as different appearances to different people. According to the flux theorist, we have the same person if and only if we have the same combination of a perception and a perceiving (159c–d). So there is no need to call any appearances false. Thus we preserve the claim that all appearances are true—a claim which must be true if knowledge is perception in the sense that Socrates has taken that definition.