aphantasia is when you cant see stuff in your mind. EXAMPLE: remember when your teachers in elementary skewl made you watch those vids with the whole class where there was an annoyingly calm voice telling you do stuff like, "close your eyes and imagine walking thru a forest, blah blah blah." I basically cant do that. EXEPT! I can daydream & dream and such, but i cant see stuff in my mind if i think about thinking abt it. confusing, yeah, but thats how it works.
on the other hand is hyperphantasia, which my cuz has i think. its where you can sooooper vividly imagine stuffs. yeha.