 The phenomenological distinction standardly turns on the notion of vivacity: whereas imaginings are vivid, suppositions are not. Indeed, one often finds in this literature the contrast between “merely supposing” and “vividly imagining”. Although vivacity has been frequently invoked in discussions of imagination, Amy Kind (2017) draws on empirical and theoretical considerations to argue that it is ultimately philosophically untenable. If that is correct, then the attempt to demarcate imagination and supposition by their vivacity is untenable too. More rarely, other phenomenological differences are invoked; for example, Brian Weatherson (2004) contends that “supposing can be coarse in a way that imagining cannot”.