 The first option characterizes their difference in normative terms. While belief aims at truth, imagination does not (Humberstone 1992; Shah &amp; Velleman 2005). If the liar did not regard it as true that his pants are on fire, then it seems that he cannot really believe that his pants are on fire. By contrast, even if the liar did not regard it as true that his pants are on fire, he can still imagine that his pants are on fire. While the norm of truth is constitutive of the attitude of belief, it is not constitutive of the attitude of imagination. In dissent, Neil Sinhababu (2013) argues that the norm of truth is neither sufficient nor necessary for distinguishing imagining and believing.