[iamthepieman]

Yes, it's all in my mind. I don't actively hallucinate. But I can put the image in my mind I to the real world. I still don't see it but I can "put it there" and trace the outline, add or remove elements and see how the imaginary object would interact with the real world.

For example, if I'm trying to see if a piece of furniture would fit, I can use this technique. I might still need a reference like a tape measure since I can't just see on a spec sheet that the bookcase is 2 meters tall and 1 meter wide and know it will fit but I do have a pretty good conception of physical space. I often set my table saw fence by eye and when checking it with a tape measure it's within 2-3mm.