Don Juan pointed directly to a boulder in front of us. “Look at the shadow of that boulder,” he said. “The shadow is the boulder, and yet it isn’t. To observe the boulder in order to know what the boulder is, is doing, but to observe its shadow is not-doing.”
“Shadows are like doors, the doors of not-doing. You may say that there is movement in them, or you may say that the lines of the world are shown in them, or you may say that feelings come from them.”
-Carlos Castaneda