You see, I can remember what things look like, I can describe places I've been to, and tell you all about them, but I cannot conjure up a picture of any of these things in my head. When I read a novel, I cannot visualise the people or places and am thankful that I have the memories of houses I've visited or TV series I've seen, which helps in this respect. I can give directions in my local area, and can remember routes to places when driving, but this is different from making a mental image. I don't know how else to describe it, but I've never missed picture in my head.