Have you ever, as a small child, wandered farther from home than you meant to or were aware of until you found yourself in a place where you had never been before? All at once you realize that YOU are in this strange place. Stock still, not breathing so you can listen, you stare at grey rocks with whorls of lichen on them like faces, tree-roots like snakes, the tress themselves heavy with leaves and silent. Your heart comes into your throat. Quietly, very quietly, you get back onto the path, then you take to your toes for all you are worth. This may have been the first experience of panic fear ... but you met someone there: you met yourself.
The Witness is that which is capable of observing the flow of what is—without interfering with it, commenting on it, or in any way manipulating it. The Witness simply observes the stream of events both inside and outside the mind-body in a creatively detached fashion, since, in fact, the Witness is not exclusively identified with either. In other words, when you realize that your mind and your body can be perceived objectively, you spontaneously realize that they cannot constitute a real subjective self. As Huang Po put it, "Let me remind you, the perceived cannot perceive."