Real shrewdness means not letting any shrewdness show. It’s not like in the movies. The truly astute don’t sit in the shadows all day striking a pose. They don’t show off that they’re using their brains. They look all carefree and innocent. Some of them are tacky and mawkish, others careless and unserious. What’s critical is not to let others think you’re a person of interest. Let them look down on you or dismiss you and they won’t feel you’re an obstacle. You’re just a broom in the corner. The pinnacle of this is to make them not notice you at all, as if you don’t exist until the moment right before they die at your hands.
– from The Dark Forest book by Cixin Liu