 This similarity between perception and mental imagery in terms of content plays an important role in thinking about the phenomenology of these states. One old question concerning the relation between (conscious) perception and (conscious) mental imagery is about the phenomenal similarity between the two (Hume 1739, 1.1.1). Mental imagery can feel similar to perception, so much so that under experimental conditions, it is easy to confuse the two (Perky 1910, see also Hopkins 2012 for a contrasting view). Assuming that the phenomenal character of a state depends in some ways on its content (an assumption that doesn’t need to be as strong as that of intentionalism), we can explain this with reference to the similarity of the content of perception and the content of mental imagery.