A disintegrating imagined landscape? That's interesting. My imagination tends to conjure static images, usually revolving around a meaningful theme or symbol. (Man with sword against darkness, old person and child both smiling.) Wonder which of our approaches is more strange.
Oh not just landscapes, it's whatever I'm trying to focus on. It's also fairly inconsistent. Just now I was repeatedly trying to imagine a single image of a woman (it's actually a specific image I've seen several times recently). One time I got the whole image, but only for a second. Another time I could only picture the outline of their face, and another time only the eyes were clear to me. Sometimes focusing on something makes it harder to hold steady; whereas images that I don't really think about are more stable, and are even capable of motion, but disintegrate as I focus on them. It can be somewhat unpleasant. Once I was trying to generate faces of girls (not that I could easily generate male faces, but I only attempted to generate female ones for some particular reason) and it went over so poorly I couldn't even remember what female faces looked like at all. Couldn't even remember my mother's face, and she was just in the next room. When I remember things about an image (like a map, say), it's usually logical conclusions, like "Location X is to the right of Y" instead of actually being able to remember what the map looked like.
And yet I have no such problem with sound. Can clearly replicate any sound I can remember (can't remember every sound, but everything I can remember I remember perfectly), modulate it however I wish, and play it back as many times as I want. I can listen to songs in my head that seem just as good as listening to the real deal. It's a little difficult to do something like imagining my mother singing the Anthem of Springfield (from the Simpson's movie, which is to the tune of
La Marseillaise), but it's doable, whereas I couldn't hope to imagine something like that visually.
This is on topic because it's pretty WTF on its own. No idea why it's like that at all. No idea if other people have it completely different.