What's more, your eyes are always moving-even when they're not open (remember, REM sleep stands for rapid eye movement). That makes your eyes one of your body's most powerful tools.
It's so powerful, in fact, that many cultures have used the eyes as symbols of power. There's the evil eye, which is described by many cultures as having such a mystical quality that you can inflict malice on someone through a gaze. There's the center of a hurricane (while the actual eye of a hurricane is a relatively calm place, the most violent weather occurs right outside of it). And let's not forget the ultimate measurement of perfection for an archer or dart-thrower-a bull's eye.