When I close my eyes and think of an apple, all I see is grey mush.
I have added a page to this site on what it is like to have aphantasia (no mind’s eye). It comes a shock to those with visual memory that some of us see nothing when we imagine or remember. It comes as a shock to those of us with aphantasia (about 2% of the population) that others actually see images – they aren’t just talking in metaphor as we have always assumed.