Blindsight is a phenomenon where visually impaired people actually know where objects are without having been conscious of seeing them. It demonstrates that there is both unconscious and conscious processing of sensory input. There is much we do that seems to happen unconsciously, but blindsight seems almost magical while also being scientifically verifiable. Actions which become habitual or intuitive, such as reacting to driving conditions, are at a different level of unconscious behavior compared to the basic skill of knowing where something is when you have no idea that you saw it. (spotted in a Wired News article)