The past is a curious thing. It's with you all the time. I suppose an hour never passes without your thinking of things that happened ten or twenty years ago, and yet most of the time it's got no reality, it's just a set of facts that you've learned, like a lot of stuff in a history book. Then some chance sight or sound or smell, especially smell, sets you going, and the past doesn't merely come back to you, you're actually IN the past. It was like that at this moment.
George OrwellIt was terribly dangerous to let your thoughts wander when you were in any public place or within range of a telescreen. The smallest thing could give you away. A nervous tic, an unconscious look of anxiety, a habit of muttering to yourself-anything that carried with it the suggestion of abnormality, of having something to hide. In any case, to wear an improper expression on your face ... was itself a punishable offense. There was even a word for it in Newspeak: facecrime.
George Orwell