“Inattentional blindness is just one example of a more general feature of our visual experience known to cognitive scientists as ‘the grand illusion’. When we look at the world around us, almost everything in our visual field appears clear, vivid and rich in detail but, in experiments, our objective ability to detect change is more suggestive of an observer with a bag on his head, with just a small hole through which to see anything. This observation hole can be moved around by the observer himself or it can be manipulated automatically when interesting events occur in the environment.”