Flat pictures — My mind indexes things on images. Landmarks for directions. Photos or memory images of events for events. Avatars in Medium and elsewhere are a blessing and a curse; I recognize the images quickly and bring up full associations, but names confound me, so when I need to type a link to someone’s name I have to pull up another Medium page to make sure I have the right one. (Exception: Mike Essig, who changes his avatar so often I actually had to memorize his name. [Luv ya, Mike! Mean it!])
Shapes, usually 3D, sometimes 2D or 4D — Many numbers have shapes for me, while others (like phone numbers) don’t (I have forgotten my own phone numbers, lots of times, to the point that I have my phone contact on myself pulled up if I think I might be asked the question). Directions to a place are shapes, both how to get there and where it is. (Landmarks, mentioned above, are just confirmation that my direction shape is correct; related but totally different.) Shapes are not images, because… they’re just not.
Emotions — Some memory/thought objects have emotions attached. Sometimes useful, others not. For example, I brushed up against something when I was trying to think of an example and suddenly I’m crying, even though I didn’t even open up the memory. A lot of my thought objects have emotions as meta attributes… if that makes sense. Maybe not so much.
Anyway, those are some pieces.