I have just found out about the condition Aphantasia. I had never heard of it before now, but after reading that article I think that I probably suffer from it! I had noticed that I find it very difficult to solve crossword clues unless I am actually looking at the puzzle. If someone reads a clue out to me, it somehow doesn't sink in, but I can often spot the answer very quickly if I am reading it myself. I have always drawn sketches to help me visualise ideas. These days I spend a lot of time using computer drawing software to illustrate ideas. If I try to imagine what something looks like, my mind almost goes blank. I can't believe that I had never noticed this before. I suppose I assumed that it is the way that everybody is, but it turns out that some people form very clear and detailed mental images at will. This doesn't apply to me when dreaming - I have very realistic and convincing dreams, but I can't seem to conjure up similar scenes when awake. If I asked you to close your eyes and imagine looking at something familiar, would you be able 'see' it in your mind's eye?