Can people actually make mental pictures of things? For a long time, I've remarked to myself that, while I often have a very good memory of things I see, I cannot picture them. For instance, I may look at a map and later be able to describe the map, but I can't "see" the map. The same is true with my other senses; I can play a tune in my head, but it isn't like hearing at all. But recently (over the past year or so), I've had many occasions when I wake up that I can retain images; I close my eyes and I can still see as if they were open. However, when I notice this, the image goes away. Because I've just awakened when I've experienced this phenomenon, I'm somewhat suspicious of my perceptions, but they're vivid enough to make me wonder. Can people actually recall a mental image as if they were actually seeing it?