I really see it. It's not hallucinating as the imagined image is not in the real world. It's like a different input to the visual processing part of my brain

I really see it. It's not hallucinating as the imagined image is not in the real world. It's like a different input to the visual processing part of my brain (but both inputs work at once, a bit like looking at a different thing with each eye). I have visual memories (snapshots I can call up) of things I never saw with my eyes (e.g. scenes from novels) that are as strong as any that came from my eyes.