I'm very interested in this topic, so I'll go ahead and describe my experience.<p>I can imagine anything with my eyes open. Any object on my desk, or a place, a drawing, abstract geometry or pretty much anything I have a reference to. If I were to visualize an apple in real life, with my eyes open, this is how the process would go: Imagine you're taking photos of the world 5 times a second. You then take those pictures into your mind and superimpose an apple onto them, like adding a layer in Photoshop, perhaps with 90% opacity or a bit of inconsistent flickering. That's probably the best way I could describe the experience. Those edits I create are on another visual layer, inside my mind, which requires an active effort to have a consistent visual experience, but of course sometimes it can passively activate and you're just daydreaming without any effort. Personally, I have a hard time imagining faces. They change, they melt, sometimes they become inhuman. I only have consistent faces in my dreams.<p>The places I know well, I can fully navigate inside my mind, just flying around a town, going down streets and such. I, of course, don't believe neither the scaling or the distance is accurate, but it's convincing and consistent enough for me at the level of abstract thought.<p>I fully get immersed in the books I'm reading or listening to. It's the best part of reading a book.<p>I can imagine smell, taste, sound, touch, sight and even other senses like balance and whatever else. Sound would be the most vivid part of my imagination. High consistency and fidelity. I also have an inner monologue which I use in second person communication, addressing myself from the perspective of another entity.<p>I have anxiety, intrusive thoughts, flashbacks and problems with rumination. I experience memories with a lot of emotion. Whenever I look at art or listen to music, I also tend to have a deep and powerful emotional reaction.