How does a brain observe visualizations and dreams? Are visualizations, memories, and dreams all in the same category as far as the brain viewing these images? I'll give you an example to help you understand a little better my thought process. If I look at a wall (it could be anything in the physical realm, but let's use a wall) I am seeing that wall through my eyes which can see the photons. But also at the same exact time with my eyes still open, I can visualize anything. It seems as vivid and real as the physical, yet I can't physically see it. It seems as it only exists within my head, but how is that possible? It has color and is detailed...how can I see an image but it isn't physical?